Sam: "I swear man, you gotta update your cassette tape collection."
Dean: "Why?"
Sam: "Well for one, they're cassette tapes. And two - Black Sabbath? Motorhead? Metallica? It's the greatest hits of mullet rock."
Dean: "House rules, Sammy. Driver picks the music, shotgun shuts his cake hole."
Sam: "Y'know, "Sammy" is a chubby 12 year old. It's Sam okay."
Dean: "Sorry, I can't hear you. The music's too loud."
(S1 E1 - Pilot)
I know this is pretty much a cliché by now, but what can I say - I just love the classics.