That's hilarious, its fun to do stuff like that.
My last job, we had a coworker, probably your clone, but is as anal as you can get with being tidy. I mean all of his pens, paperclips, everything just as neat as can be. So he had to meet with clients one day, and myself and another coworker took the smallest post-it notes you could find, you know those bookmark ones basically, and we put them all over his desk, chair, I could not tell you how many we put on there, but it was a ton, spilled over his pen holder, and anything else on his desk. We went back to our routine---one coworker said she loved it, thought it was brilliant, our boss loved it....well that coworker went with another to go look at it, they came back to say it was all taken off. Apparently one of the other supervisors saw it, took it all off before his return because she thought he would not like it :no: