So you might be wondering: If even Tarantino can't get away with showing too much blood in a trailer (it's why the vampires in From Dusk Till Dawn were apparently filled with green juice), then how the hell did Stanley Kubrick put this in a trailer all the way back in 1980?
It seems the elevator was full of horny anime characters.
That's pretty much the whole trailer for The Shining, by the way: a static shot of an empty lobby filling with blood. How did Kubrick convince the censors to let him do that? By being full of shit, essentially. When Warner Bros sent the trailer to the MPAA, they called back to ask what the literal bloody hell they'd just seen (and presumably to tell Kubrick that if he needed anyone to talk to, they were there for him). WB's response: That wasn't blood, it was merely "rusty water." Obviously, the MPAA bought it, because a wacky comedy about a hotel with poor plumbing sounds exactly like the sort of movie Kubrick would do.
"HEEEEERE'S JO-- holy shit, Wendy, did you clog the toilet again? God damn."
Audiences weren't fooled so easily, and a furious MPAA pulled the trailer from theaters. Dooming that poor movie about shiny stuff or whatever to total obscurity.