Back in the mid-90s when I lived in Philadelphia I was returning home from a weekend at my parents' and was flying PIT-PHL and I ended up sitting next to Jason Kendall from the Pirates (in coach, no less!). He was flying to Philly for the All Star Game. I didn't know who he was, so I didn't talk to him.
About a month later I was flying PHL-PIT and Tom Bosley (Mr. Cunningham from "Happy Days") was sitting in F.