I have had little to no brushes with fame.
I once saw Nathan Horton (Bruins hockey player) when I was walking down a sidewalk. I once missed seeing Robert Downey Jr. eating his lunch during a Universal Studio tour by a few minutes.
There's this pretty funny guy on YouTube called Nathan Barnatt: http://www.youtube.com/user/nathanjbarnatt
He's not that well known (only about 60,000 subscribers), but I've seen him in a couple commercials. Anyways, I've always liked his videos, so it made me happy when I saw that he had commented on a few of my own YouTube videos. I can't remember exactly what he said on each, but they were positive, something like "awesome video."
Well, these are practically nothing compared to other people, but I'm fairly young so I'll see.