This is a video of Maisie Williams (Arya Stark) pranking Game Of Throne fans (who came for a Game Of Thrones giveaway) at a hobby store in Santa Monica, California by pretending she's a clerk named Loraine. In order to score some free Game Of Thrones swag she makes them act out scenes from the show. The highlights are 1) the first guy who walks in that we never see again for the rest of the video, presumably because he ran out to furiously write a love letter on his dashboard and 2) the older lady in the purple jacket pretending to be a dragon at the end. What a beautiful creature. She may actually be somebody's grandma, but she'll always be a terrifying, fire-breathing dragon to me.
Keep going for the video.
Thanks to Ryan L, who tried to tell me he ran into Jon Snow in the frozen food aisle of the grocery store once.