For Jack -
Chewin' the Fat is scripted by / main actors are Ford Kiernan and Greg Hemphill.
One of their regular skits was the Lighthouse Men (which you can find on youtube and possibly other sites!) where Ford would be bemoaning something, Greg would dae sumpin' nasty tae him, Ford wad say ' gonnae no dae that' and the response wad be 'How?'
(I might have got mixed up as to which lighthouse keeper sid what - but Robbie Coltraine wisnae in the cast!!!!)