Darn! I forgot my evolution joke...

...on Darwin's birthday. A gorilla is in his cage at the zoo reading two books simultaneously. In one hand he's holding the Bible, in the other The Origin of Species. Another gorilla sees this and asks what he's doing. "I'm trying to decide," says the first gorilla, "If I'm my brother's keeper, or if I'm my keeper's brother." Ba-da-bum.