If you're not a Grumpy Cat, you can download the #grumpkin stencil pdf here, and make your own for Halloween.
Here are some more #grumpkins:
Not really though...the star from HBO's "Game of Thrones" had an opportunity to meet the adorably unhappy cat and decided to play along with his grouchy selfie companion.
UPDATE: We've learned this fantastically grumpy picture is a photoshopped fake. Either way, the resemblance is pretty uncanny. Well done, internets!