Fussbudgets, sticklers, officious types, whatever you want to call them — they are comedy gold. We’ve all had run-ins with them, which makes the comedy aspect universal.
TV Tropes calls these characters Sticklers For Procedure.
An essential component of the comedic fussbudget is ‘mechanical behaviour’. The scene above is from the film Meet The Parents. Note how both women behave like robots. If they really were robots they’d more appropriately fit into horror or sci-fi, but when the setting is realist, their fixed smiles, lack of emotion and recognisable, stock-standard responses enhance the humanity of the straight-man, our underdog hero, and for some reason we find mechanical behaviour in humans extremely funny. The adult equivalent of putting a hat on a dog.
Perhaps it’s even more funny when the mechanical person is a woman, as it often is (though not always, by any means). Is this perhaps because in real life we’d expect more emotion and empathy out of a woman than we would out of a man? In any case, when a woman behaves in this way there’s a distinctly Stepford Wives vibe to it.
We have a slight variation in Planes, Trains and Automobiles.
The audience, as well as Steve Martin’s character, is shown the robot’s human side first before she snaps into robotic mode. This makes the comedy all the sweeter when she slips out of it again at the end of the scene, and turns into a Jerkass who sticks to the rules just because she knows it will inconvenience someone who’s just been rude to her.
The ‘Computer Says No’ series of Little Britain sketches uses the same mechanical behaviour — the more sketches you watch the funnier they become, because you know the line that’s coming. But here is the first one:
These are all examples of extreme robotic behaviour, but if we widen the definition, it includes any situation in which X occurs and Character does Y. Catherine Tate’s creation Lauren is funny because we know, after any provocation at all, she will embellish the initial slight and eventually she will ask, ‘Am I bovvered?’ and ‘Are you disrespecting my family?’