My American History teacher kicked serious amounts of ass. In my grade 12 year, there was this guy who was just a huge dumbass all the time. He had taped 2 pens together and was making helicopter noises and spinning them around. My teacher stopped his lecture, slowly walked over the this guys desk, and held out his hand. The guy gave my teacher the pens, and my teacher held them up the guys face and said "If you do not shut up and start paying attention, I will wedge these pens so far up your ass the next time you sneeze they'll be deadly projectiles. Capeesh?" I thought I might die laughing.
Another time there was a guy making noise outside my math class door, and he wouldn't stop, so my teacher opened the door, and threw a math textbook at him. Best math class ever.