[I'm probably interpreting this question wrong, but just to clarify: I'm answering it as if "dream pairing"="the kind of relationship you'd like to have in real life", which is completely different from "what pairing would totally be believable in real life". Being a romantic realist sucks, doesn't it.]
So if you asked me what two movies would I watch and NEVER GET TIRED OF EVER, my first answer would be
Terminator 2: Judgment Day. And since there aren't any romantic pairings in that movie (unless you count That Deleted Scene, which, while a nice bonus, isn't really up there on my pairings list), then I guess I'm just going to have to go with my second answer instead. What it lacks in the firearms department, it makes up for in romance, more or less. @_@
( Day 11 - What is your dream pairing? [Times are hard for dreamers.] )