I also think a lot of speedrunnimg tecniques demontrate the "anything can happen" nature of undefined behavior in an viscerally, not-purely-theoretical way. Wha

I also think a lot of speedrunnimg tecniques demontrate the "anything can happen" nature of undefined behavior in an viscerally, not-purely-theoretical way. What happens when you don't take undefined behavior seriously? Well, then Mario can backward longjump into a parallel universe and teleport enemies on a whim.