[Pierced teen in ripped jeans and a Slayer t-shirt]: "My whole life is fuckin' metal. I bleed metal, man!"
Biology teacher: "That's true, Trevor, your blood literally contains iron. In fact, you could say" [whips out guitar] "we all bleed metal."
[Starts shredding; kids in class go bonkers]
"Hi, I'm Kip Winger and I'll be your freshman biology teacher."