“A window seat,” I answered when the man at the check-in asked if I wanted to sit by the window or the aisle.

“I have 17A,” the man said. “How does that sound?”

“That is impossible,” I replied. “I cannot be in an A-seat. I cannot watch over the ocean when we come in for landing. I need to see land. I cannot imagine the descend into the ocean. Don’t you have any F-seat available.”

“Yes,” replied the man. “20F is free.”

“20F,” I echoed. “That is 527 in the hexadecimal system. 17 times 31. 17 times 3 plus 1 is 17 times 4. 174. Which is almost like 17A. Almost exactly the same seat as you offered me at first!”

“Pardon?” said the man. “Does that not suit you either?”

“But, yes,” I replied. “Don’t be silly. Of course that suits me.”