Research was carried out to find the world's funniest joke. The findings were broken down and listed by country.
This is the UK's funniest joke, they say:

A mother gets on a bus with her baby. The bus driver says: 'That's the ugliest baby that I've ever seen. Ugh!'
The mother goes to the rear of the bus and sits down, fuming. She says to the woman next to her: 'The driver just insulted me!'
The woman says: 'You go right up there and tell him off.  Go ahead, I'll hold your monkey for you.'