Having a human-replicant on the other side of the wall punch a hole through to me, grab my hand and pull it back through to him. Then, one by one, he breaks each of my fingers. I saw Blade Runner at a much too impressionable age, apparently, ‘cause that scene has haunted me my whole freakin’ life.
Drowning. Even though I would spend 10 hours a day in water if I could. Also shark attacks, but mainly because the shark would drown me as a sideline to biting my legs off.