Oh god, so many... I'll list my top two then, just because I can't decide which one was actually better. (:

One of my work colleagues left to go to Cape Town, so we filled his Corsa sedan with helium balloons and wrapped his car with clingwrap. :D The good sport that he was, he still climbed in and drove forwards about 2m with all the balloons. Lol.

Then for my boss's birthday, we wrapped literally everything on and around his desk in newspaper. His phone, monitor (secondary for a laptop), his shelves, everything on the shelves, etc. Took him a few hours before he could get back to work stuff after that, and some things still stayed wrapped for a few months... If I can find the photos from this I'll share them.

Ah, we have so much fun here... Hehe.