Throughout some episodes of The Big Bang Theory, there have been some contradictions, which include the following: * Sheldon is sarcastic to Leonard, telling him that "Archimedes would be so proud" in the "The Big Bran Hypothesis" (Season 1 Episode 2) when Leonard fails after invoking the mathematician's name and teachings. In the following episode, "The Fuzzy Boots Corollary," however, it is made apparent several times that Sheldon does not understand sarcasm and even needs a SARCASM sign. It may possibly be that Sheldon knows what sarcasm is, but he can't tell when other people are using it. * In "The Fuzzy Boots Corollary", Leonard mentions Sheldon gets asthma when he is around cats. In "The Griffin Equivalency" (Season 2 Episode 4), Sheldon said that his family had a pet cat nam