What gross things have you found during PC cleanup

OK, I know all of you out there have at one time or another found something repulsive when cleaning up a PC. What I want to know is what items have you found in/on a PC when a user complained something did not work.

Recently I was called to a users desk because they claimed the keyboard was not operating correctly. Many of the keys were sticking or just not working.

Well, I got to the user’s desk and picked up the keyboard, turned it over to see what might shake loose. Lo-and-behold. Hundreds of fingernail clippings dropped out and deposited themselves onto the desk. I just left the pile there and asked them to clean it up. I was not about to touch any of it.