Recently, one tenacious Reddit user posted some enlightening gameplay footage from Punch Out, a beloved classic NES game from 1987. Even after all this time, it seems that there are still a few secrets that gamers have yet to discover.

The discovery is one that reveals to the player a key moment in which certain opponents can be KO’d in one hit. There is a bearded man in the crowd that ducks his head when the player is supposed to punch. By timing this correctly, the game’s protagonist, Litte Mac, will knock out his opponent with a single punch. Check out the explanation video below.