My favorite has always been the spanking of Pia in the battle of the villa fioritta made back in the 60's. Pia is a very pretty 12 year old italian girl played by I believe Olivia Hussey who gets spanked by her father Rafe after spitting out her dinner during a protest. I remember watching this film for the first time as a pubescent lad with my parents on a sunday afternoon. I remember feeling very flushed as it seemed of great interest to me was it the spanking or those frilly knickers.
http://www.punishmovies1.com/otk/member3/svc/start.html
it is line 8 second one in.