From today's newpaper:
On this day 34 years ago, Pope Paul VI issued "Humanae Vitae" restating the church's ban on artificial contraception.
You may remember it as the encyclical built for two.

Personally, I'd suggest the newspaper is wrong. That was an encyclical designed for three.

Some years ago there was an ad in the local rag for an airline that had a deal with a Las Vegas casino to haul the gamblers to Vegas at no charge.
However, they misused an apostrophe, and the headline read, "Gambler's Fly Free." I have no idea how many gambler's flys they gave away!