Oh dear... my ultimate worst experience other than with saves that all of a sudden aren't saved anymore(Shining Force 2, Final Fantasy) is with the long ass super mario bros 3 for the NES that doesn't have a save option in the first place. I was playing it from begining to end, every single stage, trying to pull the turn the hammer brother into ship tricks in every stage, EVERYTHING, and I had made it to World 8 the 1st panel, past the airships, tank thingys, handtraps, and I was trying to fly up in the first panel stage, and then, when I hear the first little tone you hear when your "p" is up to the max, the freakin Nintendo decides to do that freakin' thing where, it plays and resets, plays and resets, plays and resets. I did what fabrizo did, and decided to give my NES a beating.
I beleive of all the stress I had when I was a kid, most of it was cause by that stupid freakin' nintendo.
And of the joy, half of it was because of that cooperative nintendo.