Back when I worked at the office supply store, we got a PC back that was returned from one of our frequent customers. It was a little outside our return window but since the dude was a regular the manager took it back no questions asked. Generally with open PCs we don't try to resell, we just sent them back to the manufacturer. The customer brought back the box and everything but couldn't figure out the puzzle of getting it all back in (understandable) so the receiving manager took it to the back and laid everything out so he could get everything back in the box. He accidentally dropped the computer and when it hit the floor the dozens of roaches that were inside the thing scattered everywhere. There was a fucking nest inside the case.
The boss didn't fuck around though, we just threw the computer and everything in the dumpster and called the exterminator.