Nancy Cartwright On The Origins Of Bart Simpson's Catchphrase

There was a time when Bart Simpson was seen almost as a national threat to corrupting the youth. His catchphrases were jotted across all types of clothing, especially his "don't have a cow, man" expression. Voice actor Nancy Cartwright, who has voiced Bart since his start on the Tracey Ullman shorts in the late 1980s, revealed that the origin for that particular phrase was tied to her marching band days in high school.Answering fan questions and spouting fun facts on Twitter, Cartwright explaine