Here's a short, cute clip from id boss John Carmack's keynote address at this year's QuakeCon, in which the brutality of Super Mario Bros. 3 is compared to the more pedestrian Mario games of today.
Why do I bring it up? Well, Carmack and his old colleague John Romero once took Super Mario Bros. 3 apart at the seams, building a complete and from all accounts damn impressive port of the game for the PC back in 1990. They even shopped the game to Nintendo, who sadly turned them down.
Well, it's not that sad. Nintendo's loss ended up being PC gaming's gain.