The Cosby Show is only scratching the surface of Cosby’s funny, Kathryn. His stand up or sit down humor is as good as it gets. Routines like “The Dentist,” “Buck Buck,” “The Chicken Heart,” “Go Carts,” “Noah,” are priceless. If you’ve never heard his 1966 album “Wonderfulness,” as I suspect Derb has never done, you really can’t criticize the guy as unfunny. He is brilliantly so.