The Major and the Minor (1942)

I'm still luxoriating amongst the golden oldies, a sure cure for modern blues.  This was the first American film directed by Billy Wilder, having originally worked in Hollywood as a scriptwriter, and a guaranteed albeit minor pleaser.  I've never had an enormous amount of tolerance for Ginger Rogers outside the Astaire musicals, but she does a fine job here as a "head-massager" (read that as you will) fed up with the big smoke and trying to get home to Iowa.  However she doesn't have enough money for the train fare and passes herself off as a 12-year old to get a cheap ticket.  Yes, it does take some suspension of belief to see that well-toned body playing a sub-teenager, but she just about pulls it off.  Enroute while running from the suspicious train conductors who have caught her smoking, she bursts into Ray Milland's compartment (the army major in question) where he innocently offers her protection.  She ends up at the military school where he is based, along with his putative fiancee, her teenaged sister (who sees through the ruse immediately) and some 300 cadets -- all of whom are lovestruck.  When Milland's bitchy fiancee discovers the truth, Rogers loses the chance to come clean with him (since of course she is now in lurve), but needless to say there's eventually the happy ending that all light comedies of this period demand.  One interesting bit of incidental information: when Rogers eventually gets home, her mother there is played by her real mother (who was not an actress but who remained pushy throughout Ginger's career.)