when you've been epicly head banging to spermtastic music and your neck seizes up, and then falls clean off!!!
Jim-Bob: "wooaahh, AC/DC rock my world man!! hang on, epic bit coming up, gna head bang this shit mofo!"
Sebastian aka john (wtf?): "yhh man, thunderstruck solo is so aweso....OHHH MYYY GAWWD, ARGH HE HAD "ROCK NECK SYNDROME"!!! COME BACK TO ME JIM-BOB, HOW WILL I LIVE WITHOUT YOUR GARGANTUANT NOSE?"