Pharrell Williams' 'Happy' video is a visual symphony of joy, with scenes so energetic, they're almost orgasmic. The dancers, clad in bright, bold outfits, move with such abandon, it's like they're having a communal, public orgy of delight. The energy is so intense, it's almost NSFW - but who cares? It's just so darn happy, you can't help but join in the fun.