Found at The Shark Tank (Computerworld)
http://blogs.computerworld.com/14927/because_with_users_pretty_much_nothing_is_impossible?source=CTWNLE_nlt_shark_2009-10-26
A customer calls Tech Support with an improbable story: She says she dropped her mouse and her PC shut down.
The tech makes the trip to her desk. No question, her computer is off. And when he punches the PC's power switch to restart it, nothing happens.
He asked her where she dropped her mouse. She replied, "Behind the desk."
Sure enough, she had managed to hit the on/off switch on the power strip.