Step on a crack: Two characters are looking at a crack on the ground and one of them says "Step on a crack, to break your momma's back!", then one steps on it. He was then told by the doctor that his mother slipped on a banana peel.
Hamburger: A guy is waiting 3 hours for a hamburger at a fast food place, but when he finally gets to the casher, he was told that they ran out.
Acid puddle: A man steps on a puddle, and says that it's not an acid puddle. But the puddle was an acid puddle.