Comments (6)

Wise Up in Magnolia
Earth Died Screaming in Twelve Monkeys
That song from Donnie Darko (can't remember the title)
Misery in Clerks 2
The End in Apocalypse Now

those are my favorites

Led Zeppelin - Immigrant Song in School of Rock
Tom Waits - Goin' Out West in Fight Club
Radiohead - Exit Music (For a Film) in William Shakespeare's Romeo + Juliet
The Smashing Pumpkins - 1979 in Clerks 2
The Rolling Stones - Gimme Shelter in The Departed

Donnie Darko-Mad World Mad World was originally by Tears for Fears but remade by Gary Jules for the movie. The entire soundtrack for the movie kicks ass, but I think that's the song you mean.

As for the original post... I assume it is a song that exists outside of the movie(Gonna Fly Now - Rocky wouldn't count).
off the top of my head
Don't You Forget About Me - The Breakfast Club
Colonel Bogey’s March - The Bridge Over The River Kwai
Living In Stereo - Fast Times At Ridgemont High
Stuck In The Middle With You - Reservoir Dogs

Some of the good ones have already been mentioned.

Still - Office Space
Wasn't Born To Follow - Easy Rider
Seamus - Rosencrantz&Guildenstern Are Dead
Just Dropped In - The Big Lebowski
Tammy - Fear&Loathing

Mad World, that's right.

Oh, man - the bowling alley dream sequence in Big Lebowski - I nearly forgot...