It's funny, because I only really consider #7 obscure.
I've subjected loads of friends to #1 through the years, so I'm surprised none of them have hopped on it. (Lexinatrix would get it in a heartbeat, but she's busy at work.)
#3 is from a holiday movie that everybody should have just seen.
and #8 is from one of the funniest movies ever made.

What's obscure?!? *grin*