Do you think I'm crazy?

Someone posted this on Facebook. It makes me smile every time I watch it. I am not really sure why. My little brother actually thinks I'm a little crazy. It kills me that they are singing a love song but the looks on their faces would suggest they are very angry. I don't know. I can't help it I just like it! hahaha

PS. Admit it, it made you smile right? If not you can consider me crazy too!