these ones, I think:

http://www.youtube.com/watch?v=Al3UQYV8Mvk

http://www.youtube.com/watch?v=eUhvw65SqWQ

http://www.youtube.com/watch?v=zm-l8rj05Dk

I think it's pretty silly -- adverts asking people not to abuse maids, labourers. It's just vanity: someone decided they'd be extra-specially good by showing how bad everyone else is. Won't make a jot of difference.

Like asking people not to beat up their wives: some people will, some people won't, but the person asking the question looks whiter than white.