A couple weeks ago, when we were getting our report cards, my teacher asked me why my report card wasn't in there and I told him it was because I didn't pay my school fees. He told that I was a bad girl, very bad girl, such a very bad girl. I'm the only girl in the class by the way. Then a few days later, I was 3 seconds late for class and he was like, "Bad girl!" I think that is pretty weird.
I mean, if random stuff like that counts as flirting then damn do I have some stories to tell you about one of my teachers o_o
Be wary.