3 Irish men in a pub called Mick, Pat and Tat. The barman says; "Are you all related?"

Mick says "yeah we're triplets!"
Barman said "Triplets, how come you and Pat are 6ft tall and Tat is only 4ft tall?"
"Well!" Said Mick. "Me and Pat were breast fed so there was no tit for Tat."