Warning: this article uses the word “fuck” a lot. More than once. There’s a spoiler for X-Men: First Class if you’ve not seen it, too.

The best gag in Get Shorty sequel Be Cool (that didn’t involve Dwayne Johnson) is at the beginning of the movie, when John Travolta’s mobster-turned-movie-producer Chili Palmer talks about why he’s leaving the movie business. “Do you know that unless you’re willing to use the R rating, you can only say the ‘F’ word once? You know what I say? Fuck that. I’m done.”

This refers to a guideline imposed by the Motion Picture Association of America, the US ratings board, which places a quota upon the number of F-words you can use in a PG-13 movie. Despite its popular predecessor’s R rating, Be Cool was rated PG-13 in the States, and so this “fuck” is the only instance of the word being used in the movie, neatly followed by “I’m done.”

While the meta-joke is one way of deploying your F-word, (see also: Crazy Stupid Love, more on which later) the bean-counting of this particular expletive, still enforced by the MPAA, usually leads to less imaginative, more random uses of the word in the middle of an otherwise innocuous script.