(and one of the two is a woman I dated 20 years after high school without knowing we went to school together until after we started dating).
Can I ask how that happened? My school was 1250 people (class was 285 or so), I think, but 98% of them went to the same high school and middle school, so even if I didn't know know them, I kind of knew who they were. Big school? EDIT: I just saw your other post. I get it now, I think.
As for me, I'm indifferent to reunions. I was lucky, in that I was a chameleon. I hung with the cool kids (largely the athletes) because I was athletic, I knew all the smart kids because I was in the smart classes, and knew most of the burners/hoods because of my neighborhood and hockey (our hockey team started as a detention class about eight years before I got to the high school). I went to my five year and it was ho-hum, but missed the ones in between because of where I lived (out of state).
Then about a year or so ago, my friend (who I do keep in touch with) says "hey come down; my wife and I are meeting so-and-so - and it was JUST going to be this one girl, best friend of the girl I went to the prom with". So I went. Turns out, my friend missed the fact that it was an impromptu reunion arranged on Facebook - I'm not on Facebook - and so there were probably 35, 40 people from my school there. It was very fun, if only because it's been so long that I had to introduce myself to EASILY 15 people that didn't recognize me from high school, and it's fascinating to me how people view the past. More than once I recall thinking, "huh, that's not how I remember it going down at all." Thankfully it was mostly for the positive, but still, it's weird how memory works (or doesn't).