A case of mistaken identity

On a recent trip, I was apparently mistaken for a salesman. I had just finished a five-hour drive and was being checked into my hotel by a very perky and cheerful young woman. When she asked how I was doing, I said something about being tired from the long drive that I had just finished.

"Being a traveling salesman can be tough," she said.

"Yes," I said, "and the worst part is that the seats of rental cars are so NP-hard."

"What?"

"Oh, never mind."

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