A man was sitting in his plane seat, calmly scribbling notes on a pad while waiting for takeoff. The woman sitting next to him, who watched him writing some strange formulas she didn’t understand, felt more and more uncomfortable with the man. Whether it was just his obscure notes, or the notes plus the fact the he had dark hair and a beard, she was concerned, and alerted the cabin crew that she might be sitting next to a possible terrorist. Minutes later, the captain of the plane approached the unsuspecting economist and asked him to leave the plane to speak to some men who appeared to be FBI agents. It turns out the gentleman was Guido Menzio, an Italian-born world famous economist at the University of Pennsylvania, and his notes were a math problem he had been working on.