Mega Man 3 April Fools Shenanigans Part 3
In Mega Man 3, if certain buttons are pressed on the second player's controller, different "cheats" can be active; such as super jumps, surviving bottomless pits and the ability to freeze and slow down time. Since these do affect gameplay pretty drastically, they also bring about some humorous side-effects.
In case there's any confusion, this is not a serious playthrough of Mega Man 3. In the spirit of April Fools, this is a joke "counter-op" run in which Duck uses the second player controller in attempt to sabotage Mega Man's journey, resulting in numerous, but sometimes humorous, deaths and failures.
After his success against Top Man, Mega Man moves on to take on Magnet Man's stage, where more wackiness ensues. With the slower time, the timing for the disappearing/reappearing blocks becomes screwed up, resulting in the blocks cluttering up the stage. I am at a loss to what caused the graphical glitch upon defeating Magnet Man, my only guess is something odd happened with the connection between the NES and the game cartridge at that time.