A: With an astro-knot!
Q: Why do cows have hooves instead of feet?
A: Because they lactose.
Q: How do you know when the moon has enough to eat?
A: When it's full!
Q: What happens when you play Beethoven backwards?
A: He de-composes.
Q: What do you call a funny mountain?
Q: Why do Norwegians have barcodes on their ships?
A: So they can Scandinavian!
Q: What makes pirates such great singers?
A: They can hit the high C's!
Q: What did the ninja order at Burger King?
A: A Whoppaaaaaa!
Q: What do you call a witch who lives at the beach?
A: A sand witch!
Q: Did you hear about the lumberjack who got fired for cutting down too many trees?
A: He saw too much.
Q: What does a robot frog say?
Q: What did the ground say to the earthquake?
A: You crack me up!
Q: Why don't lions eat clowns?
A: Because they taste funny.
Q: What do you call a belt made out of $1 bills?
A: A waist of money.
Q: What do you call a belt made out of watches?
A: A waist of time.
Q: What do you get when you drop a piano down a mine shaft?
A: A Flat Miner
Q: What's the first thing a taxi driver says to a wolf?
A: Where, wolf?
Q: What do you call a sleeping dinosaur?
A: A dino-snore
Q: What happens when you get a bladder infection?
A: Urine trouble
And, a few nerd jokes for good measure...
Q: Why can't the Ender Dragon understand a book?
A: Because he always starts at the end.
Q: Why do Daleks eat apples?
A: Because an apple a day keeps The Doctor away.
Q: What do you call a time traveling cow?
A: Doctor MOO!