Q: What is the tallest building in the entire world?
A: The library, because it has so many stories.
Q: What did the big chimney say to the little chimney?
A: "You're too young to smoke."
Q: What nails do carpenters hate to hit?
Q: What's the difference between a cat and a complex sentence?
A: A cat has claws at the end of its paws and a complex sentence has a pause at the end of its clause.
Q: What is the lightest thing in the world?
A: A penis because just a thought can lift it.