One thing in response to what has been mentioned about 'A Clockwork Orange', actually I liked that earlier referrence of 'A Crockwork Lemon', being a young person's film.  That is an accurate label as far as I have been able to ascertain, but I saw the movie for the first, and only time, at around age 16 or 17 and couldn't stand it from the start.  Just exactly what was Kubrick trying to do, make me dream about penises all night?  Four other films I did not like:
Lord of the Rings(watched it while babysitting my nephew-sorry, but it had to be qualified)

Pretty Woman

Boogie Nights

Crouching Tiger, Hidden Dragon



