You said something that may be a POSSIBLE NEW CATEGORY. Perhaps call it, JUMP SCARES. The person being surprised/scared must literally leave the floor. Not to be confused with your category Jumpy People Getting Scared.
Im 50 and grew up with a father that loved to scare us he does it to his grandkids too. He is 78 in June and he LOVES these viseos. I send them to him. My mother said he laughs himself silly.