There are so many important things our animal cousin the gorilla can teach us: how primate brains develop, how social hierarchies form, and how to give the silent "f*ck you" known as "the finger." At least, that's what the mother of human girl Riley Madison discovered on a trip to the Columbus Zoo. There, a stoic gorilla taught li'l Riley the most important life skill she might ever learn. If only all the animals at the zoo taught kids different ways to say "f*ck off." Then trips to the zoo could be truly educational.