Work (harmless) pranks thread

Someone did this at my work place to a guy who is one of those who is always stuck up everyone's rear end and thinks he knows the answer to every problem.

They took a small shad and taped it up under his desk. It took a few days but the stench became unbearable in his office. Everyone had him convinced that it must have been a small animal that died in the wall near his desk. He had every kind of air freshener he could buy placed around his office.

Luckily I didn't have to work anywhere near his office.