When is a door not a door? When it is ajar.
What can run all day without getting hot? A cold water tap.
A man is six feet tall, he's an assistant at the local deli and wears size nine shoes. What does he weigh? Meat.
What type of cheese is made backwards? Edam
What question can you never answer “Yes” to? What does “N-O” spell?
What gets wetter the more it dries? A towel.
What word is spelled incorrectly in every single dictionary? Incorrectly.
Time flies like an arrow. Fruit flies like a banana.