I'd have to say RBHILL. The man is either a religious nut case or so sarcastic that you have to have drowned in gospels of biblical proportions to actually know he's not being serious.
However, Dr. Scribbles, at one point (way before most of you were born) had me in fits of giggles with every post he wrote.
Then again, I'm not around often enough to do justice to many of the newer posters here. I'm sure there must be some classic stuff of late. Surely...
Anyways, I'm off again. Chores to do, cars to drive and sheep to shag.