Legendary comedian Richard Pryor makes a rare TV appearance in the Dec. 1 episode of ABC's Norm (Wednesdays, 9:30 ET/PT), poking fun at his multiple sclerosis. In an opening gag, Pryor jumps out of his wheelchair -- with the help of a stunt double -- and attacks Norm (Norm Macdonald), whose back is turned. Norm accuses Pryor of faking his disability (''You're not really a cripple!''), then drops him to the ground, hitting his head. The injured comic's response: ''I'm a rich cripple.'' Pryor liked Macdonald's work from Saturday Night Live, so Norm producers invited him to appear. ''We were surprised and happy he went for it,'' says co-creator Bruce Helford.