It's hard to choose a favourite out of him and Rich actually. The series wouldn't work without them both in it.
I like the sweary priest though I always crack up when someone who's supposedly "religious" doesn't act like it at all (eg. the vicars/priests in 'Fun At The Funeral Parlour' and of course our favourite Royston Vasey vicar, Bernice )
The "Rapper with a Baby" one is on YouTube, one of the first clips I ever saw actually. And the guitar lessons one, with the little kid going "f**k yeah!" Why is it when I hear little kids or elderly people swear it cracks me up?