Well the first metal band I ever heard was Rammstein. But I didn't even really comprehend what I was listening to at the time. The song was "Feuer Frei". I liked listening to it while I was pissed off.
What really got me into rock/metal is Linkin Park, saw Numb and In The End on music television and searched for more of their music/music similar to them. Too bad I can't listen to them anymore, they bore me now