It reminds me of a lecture I attended in university. The speaker was an American astronomer. He started the talk by relaying what happened at the Toronto airport. The security person had asked him a few standard questions.
"So, what's your reason for visiting Canada?"
"I'm a professor. I teach astronomy. I'm here for a lecture series for a week or so."
"Astronomy, ay. What's that exactly?"
"Oh, I study the planets, stars and other galaxies. You know lots of peering through the telescope."
The security fellow was stunned.
"They pay you to do that!?"