I would have to say that I am split between when the Fellowship leaves Rivendell, because it always makes me emotional, and I love when Frodo asks Gandalf what way is Mordor, and the scene at the end of TTT when Gimli has the sword in the head of the orc. That definitely is my most favorite humorist scene, but then I also love when Gimli gets drunk and talks about "the little hairy women" in ROTK