I think this one may be impossible.

There is this song I NEED to know. I just caught a really short clip of the video on MTV which was of a guy walking around the street in a stalking cap and singing "I'll do...anything you want me to" or maybe "I'll do...whatever you want me to." kind of an emo sounding voice. Help.

No it's not impossible; perhaps just a little temporary insanity. Could it be a cover of the Beatles "From Me to You"?