[startup] had a staircase with a glass wall beneath it, which people kept walking into. They decided to make the space under the stairs a ball pit, because ball pits are cool and people would then see the glass. Except they made a fake ball pit on the cheap by filling the space with boxes and putting ball pit balls on top and around the sides. Inside, the boxes were warm and dark, so in no time at all they had rats and their fake ball pit was filled with piss and shit.