Have you ever wondered who was the first to incorporate adult jokes into cartoons? Was it The Simpsons? Or maybe the good old dirty cartoon Ren and Stimpy? Well, technically, the first fully adult cartoon was made in 1906 called 'Humorous Phases of Funny Faces,' but once again, we have to thank our dear friend Shakespear for embellishing seemingly innocent writing with sexual innuendo and subtle dirty jokes.