We are Young by Fun
There is something about this song that I cannot turn it off when it's on. I love it.
And really, there is nothing more I can say. I will download it from iTunes here soon and listen to it over and over and over because that is usually what I do. I have a song and do nothing but listen to it over and over until everyone around me hates it.
So look out Matt, this is my next obsession.