I don’t often embed videos in this blog: life is short, and you can waste a lot of time watching video online. It would be a shame to overlook this one, though. You’ve probably seen the original (superbowl) Old Spice video currently at around 11 million views).
Update (2-Jul-10): the original ad won a Cannes Lion award. Thanks, @jetswain.
Why does this series of ads work so well? It creates a sense of wonder (how did they do that), has a playful attitude, and keeps mentioning the product. It’s made, I think, to be shared with other people.