Your mention of Harry Potter movies was totally not the direction I was expecting the rest of the post to go. I saw Dirty Dancing for the first time at a friend’s house on a sleepover–I remember wanting to see it when it first came out, but I wasn’t quite old enough. Or rather, we didn’t see many movies as a family, and I was a little afraid that the title would doom the movie. A couple of years down the road, the friend with whom I was having the sleepover was shocked I hadn’t seen it, so presto! our movie choice was made.
I also recall having seen a movie which involved Person A having sex with Person B, then B having sex with C, then C with D, D with E and so on back to A. Wasn’t my idea, and I’m not entirely sure whether my parents would have been more amused or horrified that I saw a movie like that(and the viewing took place during a choir trip in a hotel, so no parental approval of the movie was require), but I remember the watching of the movie clearly–we were kind of at the age to be aware of sex, but not yet really interested in having sex, plus those of us watching were all social misfits to one degree or another.