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It's a music video actually, but here's what I remember:
It starts with a concert for a boy band type group, with the audience cheering and whatnot. The boy band is on stage singing, when suddenly the audience stops cheering, and looks back. Some guy shows up in a medical gown with a bald cap and starts singing the chorus of the song. The audience just stares at the guy, and the band tries to out-sing him. The guy looks at the band and starts shooting lasers from his mouth and killing the band members one by one. Eventually the guy gets back on stage and the band reappears in different costumes and they start singing again.
I know this is a long description, but the music video just kind of freaked me out and I can't remember the name of the band or the song. The video looked fairly recent, at least based on the special effects.

I can't really remember the song's lyrics, I do slightly remember its music video. It involved someone moving through a bunch of scenarios with different clothing on. One of them involved being on the ground in a football uniform. The last scene shows him walking away from the camera's view, possibly with a girl, but I don't really remember it.