Skeletor depicted on the sticker on this school crossing sign is a fictional character and the primary antagonist of the Masters of the Universe franchise created by Mattel. He is the archenemy of He-Man.
Having learned this as I prepared today's photo, I dug a little deeper and found a webpage devoted to the sayings of Skeletor. If you want to take a lesson in raising your self esteem, look no further: http://tinyurl.com/kyxj6k6