I just heard a good one from one of my coworkers....
We just had someone who was trying to recover a file that was deleted accidentally by changing the date on the computer to in the past when the file existed.
What is worse, is that this was done by the tech for the site.
I called a client wanting to know how many Windows PCs they have in the office. I guess she didn't hear me say the PCs part because she responded that they don't have any windows--just doors.