The 1980 disaster-film spoof “Airplane!” isn’t exactly known for its subtleties. But there’s at least one less-than-obvious gag that your humble trivia author missed in six viewings of the film. Whenever an exterior shot is shown of the jet in flight, the sound effect is that of a propeller-driven plane.

Scientists estimate that there are about 40 species of flightless birds in existence today. What nation has more species of flightless birds than any other?

A) Australia

B) New Zealand

C) Brazil

D) Argentina

Answer Monday

Thursday’s answer: According to actor Alan Alda, “It isn’t necessary to be rich and famous to be happy. It’s only necessary to be rich.”