Paddy was walking down the road with a sack over his shoulder when he met Mick.

'What's in the sack, Paddy?

'Chickens' said Paddy.

'How many chickens? Paddy' said Mick.

"if you can guess, I'll give you the both of them' said Paddy.

'Three' said Mick.

An oldie but goodie  

Cheers Bob