What's your most favorite glitch in a video game? If you ask me its the -1 glitch in Super Mario Bros., why because it just is. Maybe its because its just one looooooooooong level(truth to be told its possible to beat it in the FDS version, which the player goes to -2 and then -3 and I think there's a -4 which acts like 8-4 that the player unlocks hard mode, if there's no -4 then it stops at -3 but it acts like 8-4 when beaten and unlocks hard mode).