"Can't they take a joke?" That's the question that came up after the 2005 Danish cartoon controversy and now, again, after the massacre at the French satirical magazine Charlie Hebdo. The suspected killers obviously reflect a tiny minority of extreme religious fanatics, but the question made us wonder: What is the role of satire in the Muslim world? First let's establish that saying "the Muslim world" is like saying "the Christian world" or Africa: We're talking one and a half billion people all over the globe — of different races, ethnicities and languages — who believe different things. That said,...