Over the weekend I wrote about an economist who was temporarily removed from an American Airlines flight for doing math. His seat opponent thought the math equations he was jotting down looked strange, so he might be a terrorist.

The University of Pennsylvania professor was taking a regional jet to Syracuse, which of course is just what you’d expect from a terrorist. As I wrote,

This just underscores the idiocy of “see something, say something.” As Bruce Schneier often says, when you encourage amateurs to do security you get amateur security.

Fortunately the man wasn’t arrested for his weapons of math instruction.

The Economist now offers a guide with top 10 ways to help future passengers know whether they’re sitting next to an economist. Here are the first 3:

1. He refuses to listen to the safety announcement because “in the long run, we’re all dead”

2. He keeps telling you that “there is no such thing” as a “complimentary refreshment service”

3. He avoids prolonged conversation with you because he has a “rational expectation” that you’re an idiot since you chose the middle seat