I just watched STIII again last week. I don't know why people criticize the "odd numbered" Trek movies, that's a great flick. (so are the other odd numbers, even Generations) Plus, gotta love Christopher Lloyd as a Klingon.
I love me some Back to the Future. I was 6-years-old when the first one came out, so I more or less grew up with those movies. Speaking of classics, I saw recently where they're going to start making the DeLoreans again.