Sir Lancelot volunteers to be the first to cross the Gorge of Eternal Peril and in doing so must answer five, no, three questions from the Bridgekeeper.
The bridge keeper asks his name, quest, and favorite color. Lance answers each correctly and goes across. Piece of cake.
Robin, however, is asked to name the capital of Assyria. He doesn't know and is cast into the gorge.
Galahad's next. He's asked his favorite color—but he gets it wrong. Goodbye Galahad.
When the Bridgekeeper asks Arthur the air-speed velocity of a swallow, Arthur asks him if he means an African or European swallow. The Bridgekeeper doesn't know so he himself falls victim to the gorge.