“What happens if you get scared half to death twice?”

“I had amnesia once or twice.”

“If toast always lands butter-side down, and cats always land on their feet, what happens if you strap toast on the back of a cat and drop it?”

“The sun got confused about daylight savings time. It rose twice. Everything had two shadows.”

“If it’s zero degrees outside today and it’s supposed to be twice as cold tomorrow, how cold is it going to be?”

“Do radioactive cats have eighteen half-lives?”

“What do little birdies see when they get knocked unconscious?”