Kidding. I'll explain.
There's graffiti, and then there's smart graffiti. We rank the Decapitator in with the smart ones, because a lot of the "installations" are really subtle. In fact, most people might not even notice that the ad with Beckham in it has him sans a head. But that's what he does: replace pieces of an advertisement so that the people (or the decapitated bee from Bee Movie, poor thing--maybe his name was Eric) within, well, have been decapitated. Leaving behind just a bloody stump.
Morbid? Assuredly. But damn, if it's not funny. Check out the full Flickr gallery here.