LoL, I've had so many professors like this. In fact, my Social Psychology/Research Methods professor took it a notch further. One day he poses this deal to the entire class mid-semester, in all seriousness: "I'll grant two As outright, right here, right now, if one of you lets one of your classmates in here punch you in the face. That's right, two As, no questions asked. Any volunteers?" As uncouth as it was, I found it hilarious and ironic. Although a few entertained the idea, no one actually accepted the challenge. My wife and I remain good friends with this guy after he left (without getting fired, amazingly). He's just one of those sardonically blunt and hilarious guys. I have to wonder if he would've stopped the students had one reared a first back...
Hah, and on another day, he was alluding to the Flintstones during a lecture to describe the social implications underlying the show or something, when a student raised his hand to ask who Barney, Fred, and Wilma were. So he types something into google and turns around to address the class while the lecture hall projector screen was up and running. Suddenly the entire screen is peppered with Flintstone porn. We all just died laughing, frantic professor included as he dove to minimize the screen. Classic.
Man, I'm still laughing at that one. Okay, moving on to the more pre-med relevant stories...