This monstrosity looks like the kind of vehicle the military would perch snipers atop of. But no, it belongs to a San Francisco speaker startup's marketing department.

The cut-rate tank is owned by Boombotix, a whimsical startup that raised $4 million in venture capital earlier this year to become the "GoPro of audio." They then went out and bought a $100,000 truck with wheels the size of SUVs and have been parking it on city streets ever since.

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