I'm guessing he thought the little kids were real, and it freaked him!....they were about his size
..or maybe you're right, he couldn't take hearing It's A Small World Afterall...over and over and over and over :)
A friend of mine took his daughter on that ride some years ago. By the time they came out the other end, they were both singing:
"We've all died and gone to hell,
We've all died and gone to hell,
We've all died and gone to hell,
We've all gone...to...hell!"