Quite a few years ago my mother worked at a law firm and became their computer technical support for the less savvy secretaries.
She was called down to one computer that sat on a desk you could barely find under all the paper. The secretary was complaining that the mouse didn't work anymore.
Mum restarts the computer, checks its plugged in etc... until she realizes that the mouse lead is moving too freely.
After clearing off the desk she discovers that the secretary managed to catch the mouse lead whilst hole punching some papers and had hole punched right through it.