I'm left handed, but this thread seems like it could get spammy real quick...
I always look for other people who are left handed in my classes and stuff. It's a really lame conversation starter.

I used to do this too, but for a different reason; in most of my classes, the students
would sit in rows at tables, two by two (rather than desks). I would seek out the other left
handed person so that one or the other would not be throwing elbows at the other.
If there was not one, then I would switch to my right hand (though I prefer my left), or take notes
backwards

.