According to OnePoll.com, who carried out the “research”, this joke was voted the funniest gag of all time:
A woman gets on a bus with her baby. The driver says; “Ugh, that’s the ugliest baby I’ve ever seen.”
The woman walks to the rear of the bus and sits down, fuming. She says to a man next to her: “The driver just insulted me.” The man says: “You go up there and tell him off. Go on, I’ll hold your monkey for you.”