Source and Imgur comments: http://imgur.com/gallery/v2myH
Stashed in: Game of Thrones!, gifs, Best of Imgur, @sophiet, @maisie_williams
Maisie is impersonating a cat drinking from the sink:
Later in the video Sophie Turner (Sansa) drenches Maisie Williams (Arya):
Sauce of original gifs is 32 seconds in:
Those two are adorable together.