I've seen a positive answer to a similar question so I thought I'd give this a go. Many years ago on Channel 4 I saw a piece of animation which I am pretty sure was called "And now you..." It was by someone who was well known for doing this kind of short animation at the time but whose name the mists of time have obliterated from my memory. I can't find any reference to this film online anywhere and wondered if anybody here remembers it.
It's difficult to explain the animation but it's sort of a rollercoaster ride POV thing and if I remember rightly there is a cowled figure and a screaming mouth that feature in too.

What is channel 4 where you watched this? (CBS, ABC, PBS, etc... )

In the UK.

Hi Stonebroke (me too by the way... :)) - I found this on Wikipedia, it talks a bit about some programming on Channel 4 called '4 mation'... maybe you'll find your clip here?
4 Mation - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/4_Mation)

Very Interesting! That name rings a bell actually. Brilliant, thanks.