In this essay, I examine the mode of operation and aim of debates in the Tibetan Buddhist traditions. I contrast the probative form of argument that was privileged by the Indian tradition to the more agonic practice favored by Tibetan scholastics. I also examine the rules that preside over this dialectical practice, which is seen by the Tibetan tradition as essential to a proper scholastic education. I argue, however, that the practice of debates cannot be reduced to this dialectical model, for it has an important performative aspect not easily encompassed by the rules. I examine this aspect of Tibetan debates, focusing particularly on the role of humor. I conclude with a few remarks on the type of rationality entailed by the importance of humor and of other rhetorical elements involved in Tibetan debates.