 Joseph Heller's 1967 play "We Bombed in New Haven" is about actors engaged in a play about military airmen; the actors themselves become at times unsure whether they are actors or actual airmen.The 1937 musical "Babes in Arms" is about a group of kids putting on a musical to raise money.The central plot device was retained for the popular 1939 film version with Judy Garland and Mickey Rooney.