Confusing Drawers

Before your co-worker arrives at the office remove his desk drawers and switch them around. He will definitely scratch his head over this one. Hint: In case you cannot remove the drawers, just remove the items and swap them

Pen Cap Swap

Take all of your co-wrokers pens and replace them with your pens that your glued caps on to the night before. He will not be able to take the caps off to use the pens.

Speak Up!

Tell the new employee that a certain someone else is hard of hearing so he better speak up everytime he talks to him. Tell that certain other person the same exact thing about the new employee. Then watch as communicate with each other in high volume every time.