Biggie Smalls
Putting one armrest up very high on a co-worker's chair, while lowing the other armrest all the way down. The perfect time to do this is when a co-worker gets up to leave or go to the bathroom. You should harass the person until they realize the arms at at different heights.
Dude, I gave Jamie a Biggie Smalls 3 months ago and he still hasn't noticed!
By Dirty Don