Memes don't last very long on the quick-paced internet, but Grumpy Cat is here to stay. With a book deal and a rumored movie, we have never seen a pet have this much success since Air Bud. Grumpy Cat, however, is far more superior than your golden, athletic pup. This feline's cynicism makes for witty comebacks and how can you not take her expression seriously? Thus, we have compiled a list of The 30 Best Grumpy Cat Memes You Can Respond to Emails With so that you don't have to deal with annoying letters from your mom or memos from your co-workers. They will think you're joking, but we all know that Grumpy Cat speaks the truth.