HHGTTG
I was a little apprehensive about the "Hitchhiker's Guide to the Galaxy" movie because of some of the early reviews, especially the one by Douglas Adams' biographer which tore the film to shreds, but turns out it's actually really good. The ads for it sort of stunk, as they made it look more like a generic sci-fi film than a comedy, but it was hilarious, and now I'm really hoping it does well enough for them to make movies of the other books. Don't panic. Just go and enjoy.