A couple of days ago, I got an email from the producer of a film. He'd seen some of my computer graphics work, and explained that they'd bitten off more than they could chew and needed people to do special effects for the film.
He mentioned some of the cast members attached to the project: John Astin (The Addams Family), Richard Hatch (Battlestar Galactica), Richard Biggs (Bablyon 5), Jason Carter (Babylon 5).
In return for my work, I'd get... (drum roll, please!) a credit on the DVD.
Sorry, but I'll pass. I wish him well in his venture, but I'm not going to put in hours of blood, sweat, toil and tears for nothing more than my name scrolling by at the end of a straight-to-video release. If it's not worth paying money for, do it yourself.