French society of people who stand up, applaud and leave when the title of the movie is used in a line of dialogue

Mark Kermode often references this group. If they have a snappier name, he hasn't mentioned it.

The group would have got good value from Doubt, as "doubt" is the very last word of the film.

Lion would be an interesting case, as the reason for the film's title is only revealed at the end, but in text rather than in dialogue.