“Our equipment says someone hasn’t turned off his cell phone.”

Since it’s Friday, here’s a lighthearted air travel story from Freakonomics author Steven D. Levitt.

Apparently, the flight attendant came on the loudspeaker just before takeoff and said, “According to the reading on my equipment up front, there is still one cell phone turned on, so please check that you have turned yours off.”

According to Levitt, half the plane started rummaging through their carry on.