Why can't towels tell jokes?

Because they have a dry sense of humor.

Someone knocked at my door last evening. When I opened it, I saw a guy from Domino's holding a chicken pepperoni pizza with extra cheese and onion rings.

"I haven't ordered any pizza," I said. "This must be a mistake."

"No, it's not," he replied. "Your neighbor forgot his Facebook password and wanted to show you what he was eating for dinner."

A little boy in my infant class came into school and told me he could spell his mum’s name.

“M-U-M,” he said proudly.

Before I could congratulate him, another little boy said excitedly, “That’s how you spell my mum’s name too!”

What is the most tired part of a car?

What else, the exhaust pipe!