Movies and Lyrics

So this is a thing that I have been paying attention to for a while;

Do you ever just hear a song on the radio that just fits (a part of a movie) perfectly?

There don't even have to be lyrics in it, just the song/rhythm itself would make a perfect soundtrack.

This is my most 'severe' case and I just had to make this out of it.

The Script - Six Degrees of Separation | 500 Days of Summer

I'm not sure if I can post this link if it's 'promotion outside of bellazon'?

I'll delete it asap if so.

I love the song 'Vacation' performed by Simple Plan, in New York Minute.