I've got two. Both from the early 90's, with DW, DS and I; DS was a bit older (11, 12).
1. We were at the character breakfast at the Contemporary, and Prince John came by. He admired my watch, then slid it off my wrist (it was an expando-band, no latch to unhook). He then held it up, looked at it closely, nodded his approval, then left! He took it behind the scenes. This happened right after we were seated, and the whole breakfast I kept looking for Prince John - and my watch. We actually got up to leave, and as I was leaving, all of a sudden I felt a tap on my shoulder; it was Prince John, with my watch. He gave me a hearty hand-shake, a pat on the back and my watch, then we left.
2. We were at the character breakfast at the Polynesian (Minnies Minehune?) when Chip and Dale came by. For some reason, these two characters have always picked on my at WDW - and I'm talking over a decade, so I know it's not the same CMs - and that morning was no different. We took a picture of them with my son, who was just at that age to be both amused and embarassed; as they were leaving, I loudly said "Chip and Dale are my favorite squirrels!" Well, they stopped, turned around and I was in trouble. While Chip gave me a "shame, shame" with his fingers, Dale actually took a butter knife and held it to my throat! Gently, of course, and I never felt threatened - I started laughing, then said "Chipmunk! I meant Chipmunk!" and I was released, unharmed. I bet that'll never happen again in this day and age, but I thought it was a hoot, and is truly a Disney memory!