I'll start with a big one for me:
Fight Club.
Fight Club is, on the surface, about rebellion and how awesome it is even if it's evil. But the hidden message is that rebellion and disenchantment with the system can only come from nihilism and never from a desire for something better. More pragmatically, it posits that rebellion can only lead to disaster and death and self-destruction, which is reactionary mental poisoning if such a thing ever existed.
meh, sometimes a cigar is just a cigar.
You'll have to grant that that interpretation is a very easy one to take away from the movie.