Visual similarity Memes

Neuroanatomy's greatest prank: the brain's erectile tissue (corpus spongiosum) bears an uncanny resemblance to male genitalia, while the glans penis resembles a miniature face. Evolution apparently has a juvenile sense of humor. Medical students who notice this similarity during dissection labs either never forget neuroanatomy again or spend the rest of their careers trying to unsee it. Nature's way of ensuring we remember our anatomy lectures, I suppose.