(Strip Number 7164, Original Publication Date, 12 August 1984)
Panel 1: We start things off with John in his workshop doing something with a chisel.
Panel 2: He carelessly jams the chisel into his index finger and yells out in pain.
Panel 3: The next day, we find him at the clinic. A patient I'll call Mrs Gronvlop notices the bandage on his finger and asks if one of his patients bit him.
Panel 4: Since John is a dullard, he doesn't realize that his explaining that he cut it with a chisel is why the woman is smiling at him. Simply put, his not playing along like a sane person is way funnier than the original gag.
Panel 5: His next patient, a Mr Potrzebie, also notices the bandage and makes the same silly joke.
Panel 6: Dimwit John's need to explain something that the man already knows is sheer hilarity.
Panel 7: An older man I'll call Grandpa Maldehyde makes the same witticism and John also tries to correct him.
Panel 8: A young woman comes in, points at the bandage and asks John what happened.
Panel 9: He frowns in world-weary anger and says the someone bit him.
Summary: Not only is John too stupid to understand when people are kidding, he's enough of a pompous ass to think that they don't actually have a fair idea of what really happened. Ah, well. Twas ever thus with the sort of jerk who runs around chasing fat kids with a towel in gym class.