When you listen to a song for the first time, and don't really like it, then listen to it a couple more times, and now it's your favorite song.
Gorillaz - Sound Check (Gravity)
The Gorillaz Effect:
1st listen: mmmh... strange song
2nd listen: yeah, it's pretty good
3rd listen: GRAVIT EH EH EH EH EH EHHHHHHH!!!!