my little margie (USA
tv 1956)

a father tells his adult daughter that
she is a naughty child, her boyfriend attempts to correct that
comment by saying that his daughter is 21 and therefore an adult,
the father then counters that by saying that he`s wrong and while
she lives under his roof and recieves his support she is an adult
child.
the father then sits down next to his daughter and tells her
that what he is about to do is a painful but necessary parental
duty, he then puts her over his knee and gives her a mild to
moderate spanking in front of her stunned boyfriend who
eventually decides to make an early exit from the house.
19 spanks are shown and a few more are heard as she yells
throughout was is a fairly light hearted spanking scene.