Airplane, arguably the greatest comedy of all time, was a parody of a forgettable fifties drama called Zero Hour. Before parodies descended into the age of the Scary Movie franchise, writers approached them with meticulous rigour. Legend has that not a single joke in Airplane was improvised or thought up on the day.
It's little wonder it outlasted its inspiration. See how Airplane was basically a shot-for shot remake of Zero Hour, with this combined video.
Shouts to Death & Taxes for the tip, and all the other websites on the attribution trail.
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