You know that feeling when you're angry and just have to let the world and everyone around you know it! So do these cats. They know that feeling all to well and have mastered the art of expressing it! These cats are mad. For a number of certainly valid reasons, but yeah, they're just plain old mad. These kitty cats are mad, angry, yelling, and expressing it in their awwdorable feline way. What is it about cats that just connects with us? Even when they're angry and profusely expressing their di…