I don't know this movie but you can try it out by uploading the movies srt file.

Brazil is a dystopian satire. I would wager that GP is asking about scenarios where there is significant ambiguity and/or situational/verbal irony.

I just gave it a try: https://www.crealdo.com/story/movie-sentiment/movies/30 Never seen the movie so I can't judge myself.

That seems like a plausible analysis, the movie becomes darker as it proceeds, though there's a false happy ending (which in some cases of ham-fisted editing is the only ending - I saw it aired on network TV in the US this way) followed by a much more somber closing.