Harry Potter and the Order of the Phoenix Easter Egg - Horned 'Homo Quadratus' (da Vinci)

In the middle of the Defence Against the Dark Arts class there is a projector. Cast Depulso on it and look at the screen. You will see some pictures of a witch with a flower, and then... Da Vinci's Homo Quadratus! if you take a closer look, you will see it's not normal - the man in the picture has longer hair and... horns :)