Final answer:
The 1980 comedy film "Airplane!" listed Adolf Hitler as the "worst boy" in its credits as a comedic gag.
Step-by-step explanation:
The 1980 comedy that listed Adolf Hitler as the "worst boy" in its credits is the film "Airplane!". This comedy film, directed by Jim Abrahams and the Zucker brothers, is known for its absurd and satirical humor. In this particular credit gag, they were clearly not being serious and used Hitler's name for comedic effect.