The first time I saw a mentally disabled person. I was in the first grade, and we were having some sort of outdoor activity day with parents in this part of campus that was a big open field. At that age, maybe half of the kids would be participating, some picking at sprinkler heads in the grass, picking up bugs, what have you.
Well, I saw this kid standing apart from most others, and he had most of his right hand crammed into his mouth, and he was chewing on it. He was also jumping up and down, but he was standing tall and just jumping straight up and down. The activity we were all doing was of no importance to him. There was something off with his face, but he still looked normal enough that I was really perplexed at what he was doing and why he was doing it.
So I started mimicking it, thinking maybe once I did what he was doing, that I'd understand why he was doing it.
Well, that didn't last long because that kids mother saw what I was doing and quickly put a stop to my quest for understanding, divulging the secret of why her son did what he did.