My history teacher. Specifically his making fun of the students- he tends to target a friend of mine, actually. I remember his threatening to beat us if we got one of the first two questions wrong on a test. He also told/tells us war stories (he fought in Vietnam) as well as stories about his relatives who were alive in the time period we were/are studying.
He likes to pretend to be strict and fierce, but once you know him, you can tell it's only an act. I'm sure everyone in the class (including myself, admittedly) were a bit intimidated by him, at first. Though now I talk to him just as much as the other students (short of my friend).