Never went to any of mine because I don't really keep touch with any highschool peeps. I have nothing in common with any of them.
I did go with my wife to her 20th reunion interestingly enough, and it was weird seeing it in action when I had no dog in the hunt. I ended up talking to one dude the whole night who was also the spouse of one of the attendees. Luckily, they had the foresight to hold it at a restaurant that had a separate bar area with football on the tube. It was quite lame for me, but I was trying to be a good husband. She showed me off, and then I got to go drink and watch football with another fellow victim.