Briefly: Despite my fear of drowning, I really enjoyed this shocking interactive video (game?). It's a perfect day until, all of a sudden, you'll find yourself drowning in the middle of the ocean. You will have to scroll up like mad in order to keep your head out of the water.
Exhausting, huh? Shot in an impressive POV, the interactive video/game/ad is trying to encourage people to wear a life jacket while sailing -- which is a really good idea. Try it here.
PS: This would be a great game for the Oculus Rift.