When I was 9, my mom took me to see David Copperfield at the civic center. Afterward he was giving autographs and I persuaded my mom to wait with me for two solid hours in a line that snaked around the building.
When our turn finally came, I looked up realized that Copperfield was sitting in a chair that was, no shit, about 15 feet off the ground. One of his assistants grabbed the paper from my hand, jumped up and handed it off to Copperfield, who signed it in a flourish, then passed it back to his assistant. The whole transaction was 2 seconds long at most.
I looked at the paper in my hands: he'd written a single cursive 'D'. When I looked back up at him with my little 9 year old's disgust, he looked down at me, cold, emotionless, with one giant eyebrow slightly cocked as if to say, "You dare question my autograph?". We looked at each other for a couple seconds and I was then shuffled through by security.
So to answer your question, no I've never exchanged glances with any celebrities.