In dubious waddle

Who wrote this?

Up spake Sir Bushwack, shouting, “I challenge thee, Sir Knight!” The purple knight laughed. “Look what’sh challenging me! You slob, I can,—hic—can lick you with, — hic— one hand tied behind my back! Come ahead!” Then did the purple knight pick up the purple axe and begin to whirl it about his head, faster and faster. Sir Bushwack waddled up dubiously with sword in hand, feebly attempted to parry, then quickly retreated. The purple knight stood and laughed.

(Via Brent)