Fun Stuff to do to your coworkers on vacation - UPDATE

Gold Medal Winner - The Superball Prank : Gizmodo

The premise is simple: the pair created a firing tube, trapdoor ceiling tile, and a tripwire. The resulting torrent of Superballs freaks out their co-worker and provides minutes of WMV-encoded entertainment.

Oh man. An update to my previous post of fun thing to do to your coworkers is here. Previous story 1 2 3 4 5. Here is the update. 2000 superballs and a trapdoor, plus video! Brilliant!