At my job there was a contest to determine who is the happiest agent in the call room. The winner would be rewarded with a one-week vacation.

So the managers rounded up those agents who were interested in participating. They had the participants stand side by side along the wall and put on their happiest faces with the biggest smiles.

A few minutes later all the participants dropped dead. They had on smiles so big that they smiled their faces in half and spilled their brains all over the floor.