Greeting cards are the perfect way to tell someone how you feel about them. Whether it's a happy card to celebrate a birthday or birth, or a sad one to commemorate a redundancy or death, someone has carefully designed it to set the appropriate tone for the occasion. That is, except for these greeting cards, which cut straight to the chase and are pretty brutal. These are the ones you should only give to someone with an exceptional sense of humor. Or your enemy. Both work!