One time i walked into a big grocery store and went into the bathroom, closed and locked all of the small Toilet Cubical's, And wrote nasty messages in all of them with Fake blood, and then i waited outside of the bathroom to watch the funniness in about 10 minuts
It was funny because a really little kid climbed under the cubical walls & got it all over himself, he came out of the bathroom screaming and covered in fake blood My own mediocre attempt at humor has been highly amusing to myself.