This quote may be inappropriate, but it is the one I remember most from a Waldo episode: "don't forget to bury them, Spanky", says Darla walking off arm in arm with Waldo after Alfalfa and Butch have ostensibly killed each other in a duel over Darla.
I wonder what did happen to Butch, though. He looked every bit the part he played. Probably ended up fighting in Korea.