If the idea of speedrunning intrigues you, allow me to present the zelda 64 world record, which stands at 18:10: https://www.youtube.com/watch?v=aq6pGJbd6Iw
It starts to get weird at about 12:30
It's quite something. The commentary is an insight into a whole world. Not quite as crazy as the some of the other recent console memory hacking stuff but its the constant need for frame-perfect timing that makes it impressive.