Grumpy Cat (RIP!) was the first of the Internet cats to achieve worldwide fame and become an icon. Cats have long been queens of the internet, but Grumpy Cat, with her icy blue eyes and unamused frown, emerged from the pack and reached a whole 'nother level of fame. We're talking merch, movies, books, and an eternal spot in the Internet Cat Hall of Fame. In fact, Grumpy Cat invented the Internet Cat Hall of Fame.