Regenerators from Resident Evil 4! The sound they make and how they jump on you if you blow off their legs. Also when you first encounter them you don't the add-on to see their weak points so they really freak you out. "How am I going to kill this thing?"
Jesus, is it snickering to itself, have a cold, what's that sound it's making?!
Playing RE7 in VR probably deserves a mention.
So that's why they made it first-person.
Anybody here remember Dr. Salvador?
Some days I just blow up.