Let's see:
- John Travolta - J Crew outlet in Freeport, ME (probably my most random encounter)
- Drew Bledsoe and about half of the New England Patriots - Daisy Buchanon's in Boston (not really surprising - lots of Boston area athletes go to this bar, or at least did at the time)
- Shook hands with Luis Tiant at Fenway Park
- Pete Rose at his restaurant in Boca Raton
- '80's rocker Corey Hart filming a music video (this was either at Glacier National Park in Montana or Banff National Park in Canada - I can't remember which)
- Geddy Lee at a hotel in Phoenix (my wife still laughs at me for calling this a "celebrity" sighting, but rock music for her begins and ends with U2)
- Not a celebrity, but when I was around 11 or 12, I sat next to Katherine Hepburn's sister at a performance of the Hartford Symphony Ochestra - I didn't know who it was until my parents told me afterward - I remember her being extremely friendly
- Steven Spielberg and Kate Capshaw at Brown University's graduation/reunion - there's an amusing story here (at least to me), but I imagine you'd be bored
- Dylan McDermott coming out of the men's room at the Union Square Cafe in NYC
- Conan O'Brien twice - once on the T in Boston in the '90s, and again just last year in a restaurant in Litchfield, CT
- Not me, but my sister saw Russell Crowe in a bar the same night that he threw the telephone at that hotel concierge (or whoever it was)