In bio we have this skeleton which I usually rearrange before the class starts to make some sort of gesture or pose, I walked in a few days ago and noticed the poor souls arm was lying detached next to him.
I went about shaking everyones hands with it and then tried to put it back... my friend grabbed it suddenly and started to hold it's hand saying, "THIS MIGHT BE THE ONLY CHANCE I GET!" And continued to hold the skeleton hand for the rest of the period :D