A thing of beauty, but useless in a fight

Into a Belfast pub comes Paddy Murphy, looking like he'd just been run over by a train.  His arm is in a sling, his nose is broken, his face is cut and bruised, and he's walking with a limp.

"What happened to you?" asks Sean, the bartender.

"Seamus O'Connor and me had a fight," says Paddy.

"Why, that little sh*t, O'Connor," says Sean,  "He couldn't do that to you, he must have had something in his hand."

"That he did," says Paddy, "a shovel is what he had, and a terrible lickin' he gave me with it."

"Well," says Sean, "you should have defended yourself.  Didn't you have something in your hand?"

"That I did," said Paddy.   "Mrs. O'Connor's breast... and a thing of beauty it was, but useless in a fight."