This one might be hard to find, but in the 1942 film Dr. Crippen on Board,
a woman pretends to be a young man, and convinces almost all the crew
members of a ship.  It's not the least bit convincing to the audience, but
that's not what is being sought, right?
 
______________________________________
| Rick Francis                |
| [log in to unmask]   | "The tygers of wrath are wiser
| Dep't of Comp Lit, Box 1107 |  than the horses of instruction."
| Washington University       |
| St. Louis, MO  63130        |               --William Blake
|_____________________________|