'Tis a sad day for animal and meme-lovers alike. Internet sensation (and our personal idol) Grumpy Cat has died. In a post on her official Instagram (yes, of course Grumpy Cat was a girl), her family shared that she had passed away from complications from a urinary tract infection. We're devastated, but we'll never forget the important lesson she taught us: there's always a reason to be grumpy. Click through for a look back at some of the best, and most relatable, Grumpy Cat memes.

[Photo via @realgrumpycat]