One could almost take the 100% cotton Batman Joker Bats And Cards T-Shirt as a really sneaky version of the Ying and Yang - the Joker and Batman are both almost cut from the same mold! I believe that the phrase is 'All it takes is one bad day to reduce the most sane person to madness'. Is Batman crazy? Is the Joker crazy? Get the Batman Joker Bats And Cards T-Shirt and decide yourself; both the Dark Knight and the Clown Prince of Crime look particularly unhinged on this great t-shirt. My guess is they are both absolutely bonkers!