He had seen it before, on muggles and on the braver of older, experienced wizards. Words, sometimes pictures, permanently inked onto their bodies. Tattoos, they were called. Sirius knew without quite understanding why that he wanted one. He got it in secret, from a man who specialised in wizard tattoos. Seeing the ten words on his skin had meant more to Sirius than anything else ever had before. I solemnly swear that I am up to no good. Four wide-eyed Gryffindors had made it up. It was now war and they were older, but they would still live by it.