The main reason this seems so unfunny to many younger viewers is that a lot of the humor was topical, and topical humor becomes unfunny as soon as the topic is no longer "current events"--how funny will "Dubya" jokes seem by around 2084, when they'll be about as old as the jokes in "Boo!"? I'm twenty-some years younger than "Boo!", and the only reason I got most of the topical jokes is that I'm a big fan of 1930s movies thanks to having grown up when TV stations showed movies late at night instead of infomercials (yes, kids, they really used to do that!) You miss a lot of the humor in older movies if you can't time-travel between the ears.
