Bart Simpson's bus driver is OTTO, a four-letter name. OTTO is a recurring character in the long-running animated television series The Simpsons. He is voiced by Harry Shearer and first appeared in the episode 'The Telltale Head'. OTTO is an eccentric school bus driver for Springfield Elementary School. He is often portrayed as a stereotypical burnout, and is often seen playing the air guitar and listening to rock music. He is also known for his love of marijuana and his frequent use of catchphrases such as 'All right!' and 'Aye carumba!'.