Monty Python and the Holy Grail, 1975
Reasons to watch: deductive reasoning, experimental physics, for instance in this scene youtube
Links: Wikipedia, TMDb, IMDB ┃ skb: yaml src
Animal House, 1978
Reasons to watch: the metaphor "turning the Faber Marching Band down that dead end alley", see this clip Youtube
Rosencrantz and Guildenstern are Dead, 1991
Film by Tom Stoppard, based on the play by Tom Stoppard from 1966
Reasons to watch:
scientific principles only work within a given set of bounds and Newtonian principles, e.g. in Gravity Tennis Court scene and Newtonian Physics scene
the problem with reductio ad absurdum is knowing when to stop, see also discussion on WikiQoute
Links: Wikipedia, TMDb, IMDB, Full movie ┃ skb: yaml src