Voted #1 on the American Film Institute's list of 100 Funniest Movies.
Voted #14 on the AFI's List of 100 Greatest Movies.
Was voted the 9th Greatest film of all time by Entertainment Weekly, and is ranked on this list high enough to be the greatest comedy of all time.
When Tony Curtis and Jack Lemmon first put on the female make-up and costumes, they walked around the Goldwyn Studios lot to see if they could "pass" as women. Then they tried using mirrors in public ladies rooms to fix their makeup, and when none of the women using it complained, they knew they could be convincing as women. There is a scene on the train recreating this moment.