I went to an impromptu casual primary school reunion last year.
It was just drinks in a local pub and there was only 10 or so of us there, most of whom I keep in touch with on Facebook anyway but it was a lot funner than I thought it would be.
I enjoyed high school and most of the real halfwits have either been forced to move away, ended up dead or are in jail but I wouldn't mind going to a high school reunion either. Sadly the last time a big group of us got together was for one of my best friend's funeral's