What's catchier than "Mahna Mahna" from the Muppet Show? (and if you dont know what this is, click this link
http://www.youtube.com/watch?v=YevYBsShxNs )
How bout Cake covering it?
http://cakemusic.com/music.html
just click on the song in the track listings to have a 15 second song stuck in your head til the end of your days! (and honestly, who doesn't want that?!)