Soundtrack Obsessions?

I recently saw the Sorceror's Apprentice, and I love the scene where the MC and his crush listen to One Republic's Secrets, offset with the tones of his Tesla coils. I hadn't heard the song before (I shun commercial radio), but now I'm obsessed with it.

What song was used perfectly in a movie you like?
or
What movie made you obsessed with a song from the soundtrack?

To Milly: You are awesome. I love the City of Angels OST as well. That song is pretty much the dirtiest song ever written by a woman that isn't rap.
I knew R&J would end up on here. It has to! Since you've claimed Kissing You and farther down, we have a vote for Talk Show Host from the same soundtrack.
I'll have to say I LOVE Quentin Tarver's rendition of When Doves Cry. OMG.

Daft Punk is always so easy to get stuck in your head. Just another reason to see Tron Legacy!

Although I don't want to be a hog, I'll also have to throw out "Garbage Truck" and "BlackSheep" from Scott Pilgrim vs. The Universe.

Leah-What a great song! I'll have to check out the rest of the soundtrack. I had to reply to second you on that Twilight OST vote. Muse. 'nuf said.

In Forgetting Sarah Marshall, there's this scene where the MC is trying to write music and can't. His song, (WARNING! INCLUDES 1 F-BOMB!) found here, is what I go to whenever I have a block while writing. If listening to it doesn't get my juices flowing, I re-write the lyrics for myself. It's hilarious.