A pen with red ink. You use it to piss off your teachers when they try and mark your work in red pen. They get really mad and go to find a new colour of pen. This is a good idea when you have really old like Mr. West. Red pens suck!
Mitch: Mark my work West.
West: O bob saget its in red pen!
Mitch: Your gonna have to find a new colour!
West: O bob saget!