I'll share my best one..
When I was a CM in the College Program way back in '88 I worked in The Chapeau Hat Shop on Main Street, MK (was I not the luckiest person in the world???). Each day during the 3 o'clock parade I would spend the time cleaning the shop because typically the guests were watching the parade and the shop was vacant. One particularly beautiful Spring day I was tidying up and enjoying myself. I was singing along with the music (yeah, you get to know every word!) and dust-busting around the Mouse Ears when I suddenly saw a man standing there. He startled me a bit because he seemed to come from nowhere! At that time there was only the entrance from the Camera Center (now the Candy Shop) and there was a wall where the DVC area is now.
He said, "You seem to be enjoying yourself" and I laughed and told him that how couldn't I? I got to spend every day in the most magical place on Earth. We exchanged a few more words and then he said goodbye and walked away. Only he walked through the CM entrance!! I was shocked and didn't know what to do (never had a guest do that before) and while I was frantically thinking about my next step a Main Street CM came in and asked me if I knew who that was. I said, "No!" and that I was sorry that I didn't stop him from going through that door. He just laughed and said he had every right to.
"Didn't he look familiar," he asked?
"Well, yes, as a matter of fact," I said, thinking all the while that he DID look familiar but I just couldn't place HOW he did.
"Want to know why?" he asked?
Because that was Roy Disney.
I met several famous people while working there but NONE could have impressed me more. It is one of my fondest memories. I will never forget his smile when I shared my joy of being there.