“Seven Psychopaths” might have, as its official rating notes, “strong violence, bloody images, pervasive language, sexuality/nudity, and some drug use.” But at its heart, this film is not a crime caper — It’s a meta-fiction about the hell one guy went through to write a movie.

It’s difficult not to notice that the protagonist of this deliciously original film, a hapless screenwriter played by Colin Farrell, has the same first name as its writer-director. Even harder to ignore are all the laughs Martin McDonagh gets from poking fun at the many cliches of moviemaking. “Seven Psychopaths” is just the second film from McDonagh, who made the 2008 black comedy “In Bruges.”