I found a lost child at
Disneyland when I was in high school... my friends and I were getting on the Peoplemover (same as Tomorrowland Transit Authority at MK) and there was a tiny 2 year old boy going up the ramp in front of us - it wasn't crowded at all and there was no one in line. We realized he was alone and yelled to the CM working the ride to stop him. Well the idiot (sorry, he was) LET THE BOY ON THE RIDE! The whole ride we were terrified that he would climb out... he was standing on the seats, etc. We came to the end and he got off... we were hoping that the parents were waiting at the end, but no.
The CM still refused to do anything! He just shrugged. So, we followed the kid. He noticed us following him and started to run. It was evening parade time and he hit a dead end of people so we were able to catch up with him. I knew about "Lost Children" but thought it was at City Hall so we went all the way down there - well turns out it's at the baby center which we were right next to when we "caught" him - duh. His parents had been waiting there, hysterical of course, so they ran down to City Hall. They were APH and said that Peoplemover was his favorite ride - I guess he just decided he wanted to ride. The CM at City Hall gave us a "front of the line" pass for Space Mountain - this was way before Fast Passes so we were excited about that, but still shaken up about what had happened - I can't imagine how the parents felt.
So, that story haunts me. Don't be self conscious about using a leash for the little ones!!!