I've never actually seen it, but have heard that a CM can refuse to let someone take a child on the ride if it is obvious that the child doesn't want to go (i.e. screaming, crying)
I have seen it, and felt very bad for the girl. It wasn't shocking. Just bad parenting in place.
It was ToT and a girl, I would say around 10, was with her parents. She did not want to go on ToT. She was crying constantly the entire wait in the boiler room.
Her parents were of no help. "Shut Up. Stop being such a baby."
I tried to console her and tell her Disney would not do anything to harm her and tried to explain the ride in a comforting manner.
Then she tells me she is afraid because she just had come off RnRC with her parents.
I said if you did that, ToT is easy!
Then she said her parents had told her RnRC "was nothing". And they were saying the same about ToT.
And obviously to her, RnRC was not just nothing.
(And saying all this with her parents standing next to her clutching her hands tightly as if she will bolt.)
So thank you parents -- she has now instilled in her mind you are cruel liars.
And she was such a sweet and polite girl. This was a time when the kid had more sense than her parents. Girl you couldn't help but like. Parents you loved to despise.
The girl was near hysterics by the time we reached the elevators and the CM would not allow them to ride.