Joker Hahnium T ShirtWho will get the joke when you wear this Joker t shirt featuring the element Hahnium? The Joker Hahnium T Shirt is black, with a green version of the periodic table entry for Hahnium, a chemical element with the atomic number "105" and the symbol "Ha," as in "ha ha ha" from Batman's most dangerous nemesis, the Joker! - Joker Hahnium T-Shirt
