Ok, here's one for Iconboy. I've heard tales of tech's finding dead mice and other related vermin inside industrial computers and/or printers and whatnot, but since I deal mainly with personal computers and small office type customers, I've personally never come across anything that large inside a machine. Here's some pictures of a few critters we've found inside machines in the past though.
As recently as a month ago though, I also found and removed a dead June Bug from a clients printer. Every time his Canon multifunction printer would try to return the print head to the park position, the mechanism would jam and the LCD would show an error. When I turned the printer off and manually moved the print head out of the way, I saw a crusty little June Bug sitting on the rails preventing the head from reaching its destination. I was on-site though, and didn't have a camera with me.
Bugs
Must've been a software glitch...