I'm not really a beginner, but I thought this is as good of a place to ask as any. What is the norm in the way of showing respect to your instructor when you just run into them on the street? This happened to me the other day while going to a restaurant- he seemed fine with shaking hands, but someone said in a book, to bow, like you're in class. I know I've had the tendency to bow just because it was habit. I'm curious on what everyone around has to say about it.