A decorated economist was removed from an American Airlines flight for doing differential equations.

The economist, Guido Menzio, was preparing for a speech at Queen’s University in Ontario. Menzio was attempting to work out some properties of a model he would be presenting at the talk, but the person sitting next to him thought the economist was scribbling out a code in Arabic.

After removing Menzio from the plane, security personnel cleared Menzio to fly and he was able to re board his flight. His nosy neighbor opted for a different flight.

Via The Washington Post