If, like me, you grew up watching films on video in the UK you might remember this VSC infomercial with Simon Bates (the former Radio 1 DJ) which explained to viewers why a film had a certain certificate.
What is amusing about them now is the dry way in which they discuss sex and swearing like it was a scientific experiment.
> Find out more about British film ratings at WIkipedia
> Simon Bates at Radio Rewind