Speaking of folk we went to school with, when I studied Law there was a girl in my class I went to school with but never spoke to, never really saw her through that.
When I changed to Maths in my second year I actually had a physics lecture first, and I was walking up the stairs in the lecture theatre when I clocked one of my good friends from school that had studied Medicine in first year but hated it and decided to take Maths as well instead (though we weren't in the same maths lectures in first year). Quite strange but cool as we never really kept in touch after school and so neither had any idea we were doing the same thing.
Anyway we've drifted apart since (mostly because I didn't go to lectures for 2 years), but about 2 or 3 weeks in some other guy started sitting with us, who turned out to be my mate's allocated lab partner.
I ended up living with that guy and his flatmate from first year in halls for 2 years and they're pretty much my best friends these days, so all I can say is that I'm glad I had a class with an old school friend, it's not all doom and gloom for some of us.