I sometimes read a satirical linguistics blog called Speculative Grammarian. That blog often posts short, one-line jokes and such. Here are some that recently amused me.
What’s orange and sounds like a parrot? A carrot.
Did you hear about the kidnapping at the nursery? He woke up.
This paradoxical statement is false.
The cannibal became a missionary because “if you can’t eat ’em, join ’em!”
What’s brown and sticky? A stick
What did the fish say when he swam into a wall? Dam!
hamster (n) 1. one who hamsts. Ex.: “I’m gonna hamst you up.”