What's the best joke you've ever heard?

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Mine is: A lady with a very ugly baby climbed on a bus. The bus driver said: "Ew! Do you call that thing a baby?!?" Mad, the lady walked and sat at the back of the bus. She told the guy next to her: "This son of a ***** just insulted my baby!". The man put his arm on the lady's shoulder and said: " Look: You have a right. No you go show that bus driver that you care! Scare him!". "That's a great idea!" said the lady. Finally the man said: " And while you're their, I'll hold your monkey!" :P