Grumpy Cat
Though recently deceased, Grumpy Cat warmed the hearts of many ever since her Internet debut in 2012. Grumpy Cat, aka Tardar Sauce, was actually a very frisky, playful girl with a cheerful attitude. When her owner posted a picture of Tardar Sauce online, her kitty instantly went viral because of her exceptionally pissed off expression. Her owner was living off tips from her waitressing job, and eventually Grumpy Cat become a cash flow franchise.