A neurologist was diagnosing a man who had lost the ability to do basic math. "What's 9 plus 9?" "12". "What's 8 and 8?" "10". The doctor shook his head. "Very interesting. What about 6 times 5?" The man thought for a second and answered "1E". "Aha, I've figured it out!" The doctor said. "Somebody's clearly put a hex on you."



