Nathan Lane in Neil Simon's Laughter on the 23rd Floor. 

He's loud, brash, and larger than life. He also happens to be the funniest man on television. Nathan Lane, is Max Prince, the top TV star whose temper-tantrums and one-liners have the power to make careers, or make misery for the writers working around him. Now the network censors want to change the show to make it more "advertiser-friendly." But messing with Max can only mean the jokes and jabs will get funnier and wilder.