This was such a wonderful memory!
It must have been December of 1997, our second trip to WDW (I think...) DS Andrew was 4. We were at the Indiana Jones Stunt Spectacular, it was to be the first time we'd seen the show. We got to the theater a little early and were enjoying our day and having fun, sitting near the control booth area toward the front.
A CM who had been chatting with us a bit asked if DS would like to help out with the show. Being (usually) extremely shy, I was sure he'd blush and say no... but instead, he grinned and nodded. Of course I gave my blessing. To my great surprise, DS and the CM happily trotted away to "costuming". A few minutes later, kiddo comes back decked out in an adult size leather flight jacket and Indy hat! When the show started, he was there on stage, in costume, clapboard in hand, with a CM who "interviewed" him, the great adventurer, "young Indiana Jones." After a few short questions and answers, he launched the show with his one great line: "Lights, Camera, Action!"
After his fabulous debut, he turned back into the shy kid who can't even look Belle in the eye when she's flirting with him!
(edited to see if I figured out how to link a picture!)