I was playing "The Forest" awhile back, spear fishing in a tiny pond. I got sick of waiting for the fish to come close and knew that chasing them around the pond would be a waste of time so I turned to my left to leave...
fucking perfectly silent feral cannibal with its face about a foot from my shoulder. I have no idea how long she had been standing there silently judging me. most effective unintentional jump scare ever.