Toughest song to get out of of you head?

[Don Corleone]

I can't explain this one at all.... It's a cold February morning. My 3 year old daughter nudges me half awake at 6AM as she climbs in between my wife and I (both of whom are desparately trying to eek out what few remaining zzzz's we have).

And it hit... the dreaded "ricochet bullet song".... You know what I mean. Out of nowhere, you hear the melody, and that's it... you can't get it out. It just rattles around and around and around. Thank God for You-Tube and I-Tunes (doesn't help get rid of it,but at least you can get a better fix than your own pathetic humming).

So the interloper into my sleep this morning? . While it is an awesome tune, and I shook many a bone at bars & house parties to it back in the day, what in sweet f^&K's sake was it doing in my head at 6AM on a Saturday morning?

So I'm curious... what are some ricochet bullet songs you all have fallen prey to? What do you think is the toughest to get out again?