Haha, yes, Spaceballs is hilarious. I usually recommend starting with Episode 1, and have noticed over time that people who are unfamiliar with Star Wars tend to like it the prequel trilogy a lot better not coming in with any expectations. I've also noticed many put Episode III right up there; while it's usually IV or V for those who watched it before. The later episodes do also resonate deeper, having known exactly what Anakin Skywalker and Obi-Wan have been through. Of course, you do know who Luke, Leia and Darth Vader are, but in general for such stories it's better knowing the past than the future.