I highly suggest watching all of them: A New Hope, The Empire Strikes Back and Return of The Jedi. They'll seem quaint at first but they are classics. Have you seen the new Star Wars movies - Phantom Menace, Attack of the Clones, Revenge of the Sith and the Clone Wars?
Well... I'd say you live up to the name of your avatar. I recommend watching all of them. At the least it's like knowing Monty Python and the Holy Grail, The Princess Bride and other classics.
I'd suggest watching those, too. You might not like Monty Python and the Holy Grail (most girls don't get into Monty Python that much) but The Princess Bride is a cult classic.
I don't, either. These are some of the best you'll find, well, the first 3 Star Wars movies and the other classics. If you aren't going to watch much, watch only the best :)
WTF ??