Ghosts'n Goblins on the NES. F that game!
Remember how the game would show you that mini-map at the beginning of every life, just to taunt you? When I was a kid I used to sit in front of the TV for hours and not get past the blue level with the demons. I did get past it one time, only to die immediately in the next one.
I'm pretty good at finishing games no matter how difficult but G&G is my personal shame. I guess there are videos on Youtube of people completing it, but I refuse to watch them.