He rewinds it and YES it's Taub from House aka Peter Jacobson.
He's so funny in his bit part (quite a number of lines too) I love him. And he has hair and classes. Perfect Science or whatever subject teacher.
I tried to find the scene or even a picture but sadly I couldn't find one.
Sorry for my squeeage. I just wasn't expecting it. Kind of like when I was watching "A Fish Called Wanda" and in the end Stephen Fry appeared. Shocked the hell out of me :)