Like most kids, Demetri Martin used to doodle during class. "Then I stopped, maybe in sixth grade," Martin says. "So my drawing has not really evolved very much."When he dropped out of New York University's law school to become a comedian in the late '90s, Martin picked up doodling as a diversion from crafting material for his stand-up act. "It became a game for me that's really similar to writing jokes," Martin, 39, says. "I've got notebooks full of drawings; some are jokes, some are just shapes."He started integrating easel drawings into his stand-up and his two-season Comedy Central series, "Important Things With Demetri Martin." He also included simple sketches in 2011's "This Is a Book," a collection of personal essays, short stories and one-liners that made the New York Times best-seller list.