What is the difference between a man and a dog? One wears trousers, the other pants.
What did the book say to the librarian?
“Can I take you out?”
Where does Friday come before Thursday?
In the dictionary.
Why did the girl tear the calendar?
Because she wanted to take a month off. What kind of clothing does a pet dog wear?
What happens when two oxen bump into each other? You have an oxidant (accident).
Why were the inventors of the airplane correct in thinking they could fly?
Because they were the Wright (right) brothers.
Source: The Biggest Riddle Book In The World/TNS