Richard Wilson (Victor Meldrew) television/radio advertising a well known butter sustitute.
Simple.
That's 'I can't/don't believe etc...'
Think he'd do it?-- Giles, Jan 23 2006 "I don't believe it" http://www.chortle....atures/meldrew.html90s TV program [neilp, May 29 2006] "I can't believe it's not" http://www.unilever...eveitsnotbutter.aspbutter substitute [neilp, May 29 2006] Not a fire hot enough to bake this.-- reensure, Jan 24 2006 welcome to the halfbakery [giles]. You might like to read the helpfile, available via the menu on the left.-- jonthegeologist, Jan 24 2006 Uhm. Little help here?-- jutta, May 29 2006 there's an actor whose character's catchphrase is (see top link) and a butter subsitute whose slogan is (see second link).
That explains why [Giles] thinks this might be funny.-- neilp, May 29 2006 Ah! Thank you so much. I'd heard of the ads, but not of the show or its catchphrase.-- jutta, May 29 2006 random, halfbakery