Most of the time when you don't like the food, if you talk to the manager you will get offered another entree, a discount, or a refund depending on what the problem was (e.g. just didn't care for it vs. it was burnt vs. there was a dead cockroach in it, etc.)

Except that, you can't put the food back on cook's table, while nothing happens with the movie as such. They still have it.

Yeah, but

a) you already saw the movie -- what's to say you aren't a cheapskate, BSting them to avoid paying?

b) you already occupied a space on the cinema that somebody else could have used

c) they already paid for the reel to the movie distributor

oh, and the most important:

d) it's a work of art, and subjective. Who said you only get to pay for the movies you like? If you don't like Citizen Kane you should get your money back?