Maisie Williams, of Game of Thrones fame, is quite a tattoo fan. She has several pieces of body art on her body and isn't too shy about letting her fans in on the placement and meaning behind them.
Her followers then went on a hunt to see if they could spot her hidden and secret ink that no one has found yet. One little tweet led to a lot of research, manpower, and heartbreak when no one could discover this secret ink.
You can't fool us, Maisie. We are too keen and cunning to deceive. We will get to the bottom of your tattoos if it's the last thing we ever do on this planet. Your fans are ravenous and will stop at nothing to know the location and meaning behind every single one of your tattoos. You can not hide, Arya Stark!