Seeking to psych out challengers in the days leading up to big fights, Hall of Fame boxer Charles “Kid” McCoy frequently feigned illness or spread rumors of an injury. Then, when the bout came around, McCoy would show up in perfect form. (This supposedly prompted reporters to wonder whether they’d be seeing “the real McCoy” in the ring.) But McCoy’s lowest blow?

In 1893, when he fought a deaf mute. Toward the end of the fourth round, McCoy simply dropped his gloves and walked back to his corner as though the bell had sounded. When the deaf fighter turned to do the same, McCoy ran over and knocked him out.