Why are elevators so terrifying?

Is anyone else as scared by “strange” elevators as I am? By strange I just mean an elevator you’ve never been in before. 

I’m pretty positive every elevator is trying to decapitate/sever my body. My biggest fear in life is getting stuck in one. I hadn’t even thought about the movie troupe where someone is ON TOP of the car trying to get in to kill you. 

Because I clearly don’t want to sleep tonight tell me, what’s the craziest elevator experience you’ve had??