Jut ask the fellow at right in the picture above, snapped by Web developer Sean Percival on Oct. 31. It's an impressively faithful likeness of Rose's unintentional BusinessWeek pose. Rose, for his part, has a sense of humor about the costume, which is impressive, given that his unprofitable company is still waiting for its long-promised payday, and that his cover picture is now apparently a cultural icon of an absurd tech-bubble thinking.

(Right pic above by Sean Percival)

Park's work explores the "increasing banalization of plastic surgery." Judging from her YouTube, it's only a matter of time before freaky body LEDs end up in Halloween costumes, horror movie wardrobes and, who knows, maybe in some sort of cosmetic body implant. People are talking these up as a Halloween costume, but Park's personal website is down, so you may be out of luck — this year.

What to wear: Khaki jacket and black turtleneck
Who you are: Rick Astley
How to play the part: Memorize "Never Gonna Give You Up." You'll be singing it all night.

What to wear: Shower cap, towel, iPhone
Who you are: "Naked Conversations" author Robert Scoble
How to play the part: Engage everyone in conversation. Ask them if they want to get naked. Hope they don't take you up on it.

What to wear: Three-piece suit
Who you are: Mashable CEO Pete Cashmore
How to play the part: Make sure you have a girl on each arm. Tell everyone you're a blogger. Refuse to explain what you actually do.

What to wear: Jumpsuits and aviator glasses for two
Who you are: Larry Page and Sergey Brin
How to play it: Maverick and Goose? So old media. With a fighter jet parked at Moffett Field, Larry and Sergey are the Valley's new Top Guns.

• Steve Jobs, ailing Apple CEO
• Kara Swisher, obnoxious AllThingsD blogger
• Sheryl Sandberg, Facebook COO
• Michael Arrington, TechCrunch editor
• Jerry Yang, Yahoo's undead CEO

How to wear it: Biz-dev blue dress shirt and pleated pants.

How to scare them: Whenever someone starts talking to you, find someone more important in the room and walk away. If anyone complains, take a mental note of where they work and swear never to write about them again, unless they offer you a stake in the company.

Next: Jerry Yang, Yahoo's undead CEO

How to wear it: Soccer mom meets Castro lesbian, with a denim shirt and blue jeans. Oh, and a Pure Digital Flip camera.

How to scare them: Find a tech-company executive. Insist on interviewing them. Blurt out the most annoying questions you can think of. If they flinch, threaten to disinvite them from your exclusive Wall Street Journal tech conference.

How to wear it: Polo shirt, khakis, and a golf club.

How to scare them: Go to Yahoo's Sunnyvale headquarters. Refuse to leave.

Didn't find the right mask? Check out the rest of Valleywag's 5 scariest people for Halloween.

How to wear it: Black power suit and a kicky necklace.

How to scare them: Find some Facebook employees. Be really, really nice. Talk their ears off about your days in Washington and how you singlehandedly solved the Asian financial crisis, with a little help from Larry Summers and Bono. At the end of the conversation, take out a notepad and ask them for their names. Frown a little as you write them down.

Next:

How to wear it: Black mock turtleneck, blue jeans, and an iPhone.

How to scare them: Find an Apple shareholder. Clutch your stomach and groan.

Next: Kara Swisher, obnoxious AllThingsD blogger

Brown Coat, or random frontier person. We talked to Shawna Trpcic, costume designer for Joss Whedon's shows Firefly, Serenity, Dr. Horrible and Dollhouse. She's all about adapting easy-to-find materials — she cut up her own wedding dress to make Inara's ballgown in the Firefly episode "Shindig." Says Trpcic:

Thrift stores are a treasure source. You don't feel bad cutting something up to make it a-line or off center, to make it other-worldly. I love the "Towns" in cities - Chinatown, Little India, Thai-town — you can get amazing costume pieces for very little, [with] all the embroidery and beading. Crazy shoes, neat jewlery. The stores that supply "work" clothes are also great, for Amish, prairie, or cowboy. You can get thick pants, prairie dresses [or] patriot shirts. Again usually not very expensive. Then the planet you choose to be from will determine the make-up.

Random cyborg mutant. We got a similar answer from Ruth Secord, who's worked on a slew of TV movies including Threshold, Bugs, Terminal Invasion, and Encrypt. Go down to your local Army surplus store and "Value Village" type stores and look for random stuff that you can put together into a ramshackle survivor of the purge of humanity.
What you'll need: Scraps of rubber and leather. Pieces of chain mail. A pop riveter. Bits and pieces of electronics. Old Army uniforms.

Nerd Herder from Chuck. We talked to Augusta, aka burlesque performer Penny Starr, Jr., who works as a costumer on NBC's series about a nerd in an electronics store who gets the CIA and NSA databases plugged into his brain. And not surprisingly, Augusta suggests dressing as a member of the Nerd Herd, the team of computer fixers that Chuck belongs to.
What you'll need: "Black pants, white short sleeve shirt, grey tie and pocket protector."

Mork From Ork. The manic, happy-to-go-lucky, finger-drinking visitor from a crazy backwards planet, from the classic sitcom. He's due for a come-back, and I'm frankly shocked the Mork movie hasn't been announced yet.
What you'll need: Shaggy hair, vertical stripey suspenders, glue-on chest hair, and heaps of cocaine.

Steampunk person. Another suggestion from Augusta, the Chuck costumer. "There's nothing more 'in' these days than steampunk!" she says. For those who slept through the past two decades, Steampunk is about imagining an alternate Victorian era that achieved high technology (including cyborgs and stuff) powered by steam.
What you'll need: Victorian clothing. For men, a white shirt and fitted (not pleated) trousers. For women, a long, full skirt. Turn up your collar, and then buy a women's silk scarf and wrap it around your neck, with a knot, to make an ascot of sorts. Buy some goggles from the Army/Navy surplus store, and while you're there, ask if they have any gaiters, which are canvas leg coverings that go over your leg like spats. "Add a suit vest from the thrift store, and get a length of chain from the hardware store for your 'pocket watch' — buy a connector to clip it to the second to last button hole and connect the other side to your iphone!"

Bodypainted superhero. If you're bald and skinny, paint yourself silver and go as the Silver Surfer. (It may help to have a surfboard, also painted silver.) If you're a bit bigger, paint yourself green and go as the Hulk. (Or She-Hulk if you're a tall, buff woman.)
What you'll need: Bodypaint. And, if you're the Surfer, a surfboard and some silver paint.

Random Stargater: Our resident Stargate expert, Meredith, points out that the basic Stargate uniform is pretty simple — and very close to actual Army fatigues.
What you'll need: Basic Army fatigues. And a patch. You can be lame and just laser print it, or you can try and track down someone like this guy who makes the real thing. Ahh... just laser print it.

Off-duty Battlestar personnel. Particularly in the Battlestar Galactica miniseries, the Galactica crew had a pretty simple uniform for when they were off duty. And yet it has the advantage of being pretty recognizeable, because who wears a tanktop over a T-shirt normally?
What you'll need: cream/tan-colored T-shirt, olive-green or dark green tank top, and green fatigue pants. Bonus points if you're female and have short blonde hair.

Col. Doctor Irina Spalko, from Indiana Jones and the Kingdom Of The Crystal Skull. She's awesome and distinctive, but also quite simple. The only hard part is the sword, but you can probably use a toy for that.
What you'll need: A blue/grey jumpsuit, similar to what maintenance workers wear. Try your local thrift store and uniform supply store. Big black gloves, big black boots, and a big black belt with a gold buckle. (You can paint the star on it yourself.) And then there's that sword, which could totally be a toy, unless you can borrow someone's real sword. And finally, a shiny straight black wig with a bowl/fringe cut, which you can find in my neighborhood for $10. Boom, you're done.

Starman. This one's a suggestion from Annalee. Jack Knight takes over as the superhero Starman, the hero his dad invented, after his brother dies on the job. Jack spurns the spandexy costumes and big fins the original Starman went for, and instead goes with a simpler, but more kick-ass, outfit.
What you'll need: Black leather jacket, T-shirt, jeans. Big goggles. And you'll have to figure out a way to make your own power rod — Annalee suggests a broomstick with a globe attached.
Another T-shirty superhero costume: Captain Hammer, who just wears a black T-shirt and cargo pants. You just have to attach the trademark logo somehow, either by glueing it on or by getting it from a custom T-shirt store. (In my neighborhood, they have a two-hour turnaround now.)

And here's a bonus idea, that's a bit harder but still pretty doable:

Cassandra from Doctor Who. Okay, this one is a bit more ambitious, but not really as hard as it seems. Stay with me here. Cassandra is the self-proclaimed "last human," who's had so much plastic surgery that she's now just a piece of skin stretched across a frame. She's bitchy and fabulous, and always seems to be hatching plans to destroy all of the zillions of other people who could lay claim to being among the last humans.
What you'll need: A metal garment rack on wheels, some kind of thin tarp or flesh-colored plastic sheeting, some paints, a rubber brain, a glass tube, a white smock, white pants, some bandages, some goggles. What you do is, stretch the fake skin across the dress rack, and attach the brain to the base of the rack inside the jar, and paint eyes and mouth on it, plus maybe a few little veins. Then you dress in all white, with the goggles, and wheel "Cassandra" around. If you can throw your voice so it sounds like she's telling you to moisturize her, so much the better.

I don't need a costume. I'm just going to go around telling people I'm the Valleywag, to see if they jump out of their skins. Trick or treat!

Yes, Fitzpatrick is haunting the halls of Mountain View dressed as Facebook. Complete with a Wall for messages.

Be sure and watch their excruciating long promo video on the front page. And you thought I needed an editor.