Joke: Why don't ducks tell jokes while they are flying?
Answer: Because they would quack up!
Joke: Why don't lobsters share?
Answer: Because they are shellfish.
Joke: Why don't mathematicians drink?
Answer: You can't drink and derive.
Joke: Why don't mathematicians need to buy wood for their fireplace?
Answer: They have lots of natural logs.
Joke: Why don't monsters eat clowns?
Answer: Because they taste funny.
Joke: Why don't most buildings have a 13th floor?
Answer: They aren't that tall.
Joke: Why don't people eat clocks?
Answer: It's time consuming.
Joke: Why don't skeletons fight each other?
Answer: They don't have the guts!
Joke: Why don't spiders go to school?
Answer: They learn everything on the web.
Joke: Why don't they have rehab for cars addicted to brake fluid?
Answer: They can stop at any time.
Joke: Why don't they play poker in the jungle?
Answer: Too many cheetas.
Joke: Why don't witches ride their brooms when they are angry?
Answer: They are afraid of flying off the handle!
Joke: Why has nobody heard of the new band 1023 megabits?
Answer: They don't have any gigs.