One evening, Paddy and Seamus are staggering home from the pub, when unexpectedly they find a head lying in the gutter.
“Feck me Paddy”, says Seamus. “That looks like Murphy's head!”
“Ah, I dunno”, says Paddy. “We'd better take it to his wife and ask her.”
So the two inebriates pick up the head, stumble round to Murphy's house and bang on the door. Murphy's wife opens the door, and Paddy holds the head up: “Is this Murphy's head?” he slurs.
The wife looks up at the head for a few seconds.
“Nah, that's too tall for Murphy.”