 Bob 's intelligence serves him in many ways . During this episode , for example , the parole board asks Bob why he has a tattoo that says " Die Bart , Die " . Bob replies that it is German for " The Bart , The " . The board members are impressed and release him because " no one who speaks German could be an evil man " ( an allusion to Adolf Hitler ) . However , his love of high culture is sometimes used against him . In the same episode , Bob agrees to perform the operetta H.M.S. Pinafore in its entirety as a last request for Bart. The tactic stalls Bob long enough for the police to arrest him . 
