I apologize in advance for this.
I have to admit, I like(d) the song “Happy” for a long time. It’s become a phenomenon and it caught me. However, it’s now become an ear-worm and each time I think I’ve got it out of my head, it comes back to haunt me again. In this case, I’m OK with it but I have to warn you if you’ve been trying to get it out of your head, don’t watch the video.
But it’s worth it.