Possession
When I was 12 or so I got invited to a birthday party group sleepover. We were pretending to use a ouija board to contact spirits and ask them questions about their lives. The other girls would get through like one question and then fold, everyone would die laughing, rinse repeat.
Except it got real old to me after the first two, so I decided when it was my turn I was gonna get proper possessed. I turned into a middle aged milkmaid from the early 1800’s really quick and ended up scaring them so bad the birthday girl went to get her mom (but she was already asleep).
They were really freaked out and that was the last sleepover I ever went to. Huh. Never put 2&2 together before now. Story credit: Reddit / oyofmidmidworld