Historians, scientist and philosophers have all credited Leonardo da Vinci as one of the greatest minds the world has ever seen. What was this master genius thinking about? DICKS! Leo loved to draw, talk and lick penis. His obsession with ween and various scientific hobbies distracted him so much that many of his commissioned masterpieces went unfinished. He'd just up and leave his patrons high and dry and went back to doodling dongs.