Two Irishmen met and one said to the other, "Have ye seen Mulligan lately, Pat?"
Pat said, "Well, I have and I haven't."
His friend asked, "Well what d'ye mean by that?"
Pat replied, "It's like this, y'see... I saw a chap who I thought was Mulligan, and he saw a chap that he thought was me. And when we got up to one another... it was neither of us."