There is (apparently) this game where a person names a city, and then the next person has to name a city whose first letter is the same as the last city’s last letter (and hasn’t been named before in the series). E.g., “Portland,” “Duluth,” “Houston,” etc. Lina told us a story about sitting in a hot tub in Hawaii and playing this game, except with the names of operating systems. They had to invent the rule that any OS ending with ‘x’ counted as the end of the series and you could start over. Lina did think of Xenix, but that ends in ‘x’.
(Okay, smarty-pants, what other OS’s begin with ‘x’?)