We got stuck very high up on California Screamin' once, over ten years ago.
We made a quick stop and I banged my head on the back of the seat.
I was sitting with my 8 year old step daughter. My husband was sitting with my mom. (Late 50s).
My mom is claustrophobic and the over the shoulder harnesses were driving her crazy after about 3 minutes of being stuck. She started to panic and sounded a little hysterical. All of a sudden I hear my husband say sternly, "Mimi, you're going to have to calm down or I'm going to have to knock you out for the good of the group."

Not a peep was made by her anymore.
Meanwhile, my 8 year old is whining that she's hungry. It's been about 10 minutes at this point. I feel in my pocket and have a piece of candy. I pass it over to her. All of a sudden I hear her gasp and cough and whisper, "Choking." I, of course, can't move because of the harness. I yell, "Oh my GOD!" and my generally calm, sweet, well-behaved 8 year old quickly says, "I'm just kidding."
Then when we got back to the hotel room I had a severe headache from banging my head on the seat and vomiting the rest of the night.

I've had better nights at Disney!