In the Seinfeld episode "The Maid", George decides that his name has taken him as far as he can go with it. He wants the nickname T-Bone. Sadly for George, T-Bone is given to a coworker. When George explains to his coworker that he was supposed to be T-Bone he becomes very animated and flails his arms like a monkey. Kruger gives George the nickname KOKO. They eventually present him with this shirt, with KOKO printed on the back. The back of the shirt is not double zero, it's oo, as in oo oo ah ah, the sound that monkeys make. Did you know that one of the girls down at the maid service is named KOKO? That girl's alright.