As a teenager, I can remember playing Super Mario III on the original Nintendo. The game with the bouncing palm trees on level two, I remember the ice world, etc. Friends of mine found warps, either by playing and learning or by using the game genie to finish, but here is a guy who found a glitch and beat Super Mario World in five minutes!

Here is the video of how the guy did flew through Super Mario World on the Super Nintendo Entertainment System (SNES)! His name is SethBling; read more on his discovery here.