Why is Douglas Adams' dialogue so funny in his books and so awkward in film or television? Husband and I just tried watching a BBC production of The Hitchhiker's Guide to the Galaxy. It was a very true telling of the story, but awkward as anything. Somehow having Arthur Dent say, "I never could get the hang of Thursdays," is hilarious in print, but just falls flat when an actor says the line.
For a quick memory boost as to how funny the books actually are, check out the wiki.