I am speaking, of course, of Galaxy Quest. I saw it on a whim while I was visiting my brother – neither of us had heard anything about it, and our expectations were low. It was a great experience.
E! broadcast a mockumentary about the “history” of the show around the time the movie was released, and a kind soul has uploaded it to YouTube. This is segment one of three:
I’m going to go ahead and put it out there: don’t watch this little confection expecting to see a lot of Tony Shalhoub. Alan Rickman, however, is as perfect as you expect (as are Tim Allen and Sigourney Weaver).
Parts two and three are linked from the YouTube page for Part 1.