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So this JUST happened two weeks ago:
My father finally watched Hot Fuzz after me bothering him about it for years, and during out latest phone call he said he liked it a lot at first but once all the zombies started showing up it got too weird.
... wut?
After some detective work it turns out he fell asleep during it and the TV must have autoplayed to Shaun of the Dead - a zombie movie with the same director and same lead actors and very similar comedic style.
He woke up halfway through that movie and never realized they were two different movies.