An old codger goes to visit his doctor about painful peeing. His wife goes with him because the poor old bloke is hard of hearing.

After an examination the Doctor says to the old man, "Right, I'll need you to leave a urine, semen and feces samples for analysis."

The old man didn't quite hear the Doctor and asks his wife, "What did the Doctor say?"

The wife replies, "He wants you to leave your underpants here, dear."