[Whataday]

This Channel 4 Ident from their excellent optical illusion era was never used on-screen. A shame as it's a good one. I think it's called Drunk Man.

youtu.be 

This seems very long to be an ident - the “4” doesn’t appear until about 40 seconds in - perhaps that’s the reason it wasn’t used? Or it was an early “cut” and would have been re-edited or remade if it was used.

Yes, I'm not a huge fan of it either. It also doesn't quite fit the structure of the rest of the set, in that the blocks have to deliberately move to make the '4' form-up and then move away to break it up, rather than it being a camera angle thing that means that the '4' is briefly formed.

Not all of those idents were about the camera angle, there were a few where the blocks moved around like that - UFO, Bowls, Sofa. It also fits alongside the one with pigeons in Trafalgar Square, for example.

It was a bit long though, that set had a few different durations to fit requirements but the longer ones were all 40 seconds. So that might be why it wasn't used, though I wouldn't be surprised if they just decided in the end that the subject matter wasn't apporopriate.

I'd say the main reason it wasn't used is that it could be seen to poke fun at people with a drinking problem.