Declining shock value united

With middle America now well aware that they're both about as threatening as the proverbial chocolate Hob-Nob, Marilyn Manson and Slayer are trying one last gasp to scare the pants out of everybody: they're uniting for a joint tour of the US.

It's not even Alien Versus Predator, is it? It's more like Abbott And Costello meet... well, Abbott and Costello, to be honest.