The most I remember from my Philosophy 101 course in college was the phrase by Descarte, "I think, therefore I am." Other than that, I don't remember much about existentialism, other than it was covered in the course.
I do know a lot about Star Wars, however, so whenever there's a good SW parody, I'm clicking away. This latest mash-up features clips from the movie with a French existentialist backdrop. The creator of the video says that the captions are actual quotes from Jean-Paul Sartre, so if you are a fan of his you'll find this hy-larious.