What's a little-known movie with a surprisingly well-known cast?

For me the first movie that comes to mind is Holes. Not too many people probably know about it except people who have read the book but good God what an all-star cast. Shia LaBeouf, Sigourney Weaver, Jon Voight, Patricia Arquette, Eartha Kitt, Henry Winkler and Dule Hill. Any other movies you know of that are lost to time but have a cast made up of loads of popular actors?