I'm sorry if it might sound a little unbelievable, but using regular playing cards on a good throw i can take large chunks out of hard wood chairs and dressers. So just think. . .if i can do that with just a playing card to hard wood, i could kill a person by striking them in the neck with a card. Playing cards are dangerous, but the reason why they are not frequently used as a weapon is because of their difficulty in aiming and in getting masterful technique. I myself still have trouble aiming effectively. I have, however, done experimentation with other, heavier and lighter types of cards, like phone cards, steel cards, hotel keys, and notecards.