That is insane! So funny!! I'm not much of a prankster, but one time when I was in Junior High I sucked up some nerve and put a fake, black rat in my Spanish Teacher's desk. When she opened the drawer during class she screamed and pulled the whole drawer out! I never had any workplace pranks, but for a long time I used to bring my music to work and apparently a certain friend didn't appreciate Beatles or Mamas and papas or Folk Rock, so they used to leave me tiny little notes taped into my cd cases, like 'That's a real beetle' with a drawing or. 'You call this singing? or once I brought in a SADE album and found a note that said, 'It's about time you brought in some good music!' haha. In a few of those cases i left the notes to this day.