For the better part of 44 years, Nintendo's 1981 arcade classic Donkey Kong was understood to have a single, definitive endpoint: a "kill screen" where a bug ensures that Mario will inevitably die before you can complete the level.
But now speedrunner Kosmic has figured out that this supposed kill screen doesn't have to be the end. The original arcade version of Donkey Kong takes place across four stages that loop in various configurations of increasing difficulty.
Those loops are displayed in-game as levels, and once you reach level five the difficulty has essentially peaked - you just keep repeating the same loop over and over again.
Excellent Donkey Kong players register their high scores in level 22, which is where the kill screen occurs. The bonus score timer overflows - Kosmic's video below goes into much more detail on how this bug works - leaving you with just a few seconds to clear the stage.
That's not nearly enough time to get Mario to the top of the screen, so you simply die here over and over until you run out of lives.