The most talked about sequence in Hitchhiker's Guide to the Galaxy was most definitely the opening sequence, involving a dolphin musical number.

As it turns out, dolphins aren't the third smartest animals on Earth. They are and have always been smarter than us. They knew about Earth's destruction for years and have tried to warn us. Too bad we took their warnings as stupid pet tricks.

So the entire musical number entitled "So Long And Thanks For All The Fish" is online in Flash form at the Hitchhiker site. Even if you haven't seen the film - or for that matter don't plan on seeing the film - you may very well enjoy this. So, So Long, So Long, So Long...