Driving me NUTS....

I've seen the commercial twice and heard the song briefly on a pop-up add from some site. My browser kills pop-ups so I didn't hear it long and now its stuck in my head.

The commercial has 2 or 3 guys and a girl in it. They're walking down the street and every fourth step (or so) they pause their step and lean back before walking on again.

What's the commercial?
What's the song?
Who's the group?

Thanks....

I think you mean this one.

That's it!

Thanks.....