I've talked with two astronauts: one in person for a newspaper interview, one on the phone for purposes related to my former job.
I've seen a Russian MiG pilot and his son get a guided tour of the National Air & Space Museum's Star Trek: The Exhibition. That was in 1992.
I've seen the Apollo 11 astronauts at the 20th anniversary of their landing, also at the Air & Space Museum. (Specifically, the plaza north of the museum; the plaza was closed off and I'd had to go through security. I was one of the last people let in to the event.)
I think I've seen at least one UFO. At least it was unidentified to me. Can that count?
I've had a phone conversation with a major film composer while I was only partially clothed. (That, however, does not beat Berkeley "Bloom County" Breathed getting out of the shower to answer the phone and finding himself, while dripping and towel-clad, talking to then-President Ronald Reagan.)
I've...what else? Oh, I guess I need to keep doing MORE STUFF.