Roy Rodgers threatens Jane Frazee (30) with a spanking in this western movie from 1948
"That's the trouble with all you society girls. You need a good spankin'! "
You wouldn't dare..."
And then she sort of spanks herself by stepping on a loose plank.
Clip: https://www.youtube.com/watch?v=_Pg2v8XA7-w
IMDB: https://www.imdb.com/title/tt0040399/