Mine would be arbitrarily slowing down a character to maintain horror in a game. I get if there are reasons like age, injury, or location that could provide context, but don't turn my legs into molasses because you need to time the jump scare just right.
I like they way it works in Earthbound where monsters spawn randomly, but you can see them and either avoid them or try to hit them from behind for an opening move.
It was really cool to automatically win if you were sufficiently leveled.