For our office secret Santa one year I drew the boss's name. I don't know him very well as he's a pretty unsociable person, for the first six months of my employment was introduced to clients as the web developer's "little buddy." So I really wanted to do something passive agressive.

I spent a few days trying to find the best prank gifts. I landed on a glitter bomb. I filled a balloon with glitter, puffed just enough air in it so it fit in the box, and rigged it up with an x-acto blade inside which would pop the balloon when you open the top flaps.

It worked fantastically. The balloon popped, glitter went everywhere, the entire office was laughing except the boss. It was days before the glitter started to dissipate from his beard.