From
http://en.wikipedia.org/wiki/Pope_Hilarius :
Hilarius (also Hilarus, Hilary) was Pope from 461 to 468.
The Sardinian Hilarus was elected bishop of Rome probably November 17, 461, consecrated November 19, 461 and died on February 28 (?), 468.
As archdeacon under Pope Leo I he vigorously opposed the condemnation of Flavian of Constantinople at the Council of Ephesus (449).
As Pope, he continued the policy of his predecessor in enforcing the claims of the Roman See in southern Gaul (cf. Epist., x., to Mamertus of Vienne, February 25, 464). He furthermore gave laws to the Spanish Church (cf. Epist., xiii.-xvii.), and the Liber Pontificalis praises his donations to Roman churches and cloisters.
Pope Hilarius was, of course, the funniest of all popes. From his name, Americans get the English word hilarious and its sister, hilarity. His humor was a beacon of light in the church during an otherwise dark time, converting many barbarians and heretics with his stand-up comedy. His "men do this; women do that" joke has been passed down from comedian to comedian all the way to the present day. (He was thanked in the credits of Last Comic Standing.) He is also the source of the famous joke that ends in "... when I woke up, my pillow was gone!"