A San Francisco citizen payed homage to failed startups by architecture tombstones in their honor last night. Trick-or-treaters near Mission Dolores Park got to attestant a graveyard of startups taken from the world too soon.

All told, the affectation featured 12 tombstones, each made of styrofoam and corrective gray by the prank’s mastermind, former startup agent Evan Hynes. “I asked myself, what’s the scariest thing that can happen to an agent at a startup?” the 26-year-old told . His answer: “Finding out that your two percent stake in a blockchain-based smart juice aggregation is absolutely worthless.”

As for the companies featured, there’s Juicero, the aggregation that sold a abandoned juicer for $400. Theranos, which isn’t absolutely defunct, but might as well be. And a scattering of others, each alms capricious levels of usefulness, not that it affairs now.