“National Gorilla Suit Day” is celebrated every year on January 31st.

Gorilla suits are recognized through National Gorilla Suit Day, January 31. The holiday was concocted by MAD cartoonist Don Martin in a 1964 paperback Don Martin Bounces Back!. The most notable story in the tome revolves around a hapless fellow named Fester Bestertester, who dares to mock the concept of National Gorilla Suit Day and is thus repeatedly pummeled by gorillas. The holiday was recently promoted on comic book writer Mark Evanier’s news from me blog until allegedly Don Martin’s widow request that all references to the holiday be removed in 2007 (but not until after Jan. 31st), unless that was a joke too.

The most infamous gorilla suit in cryptozoology history is the one used for the 2008 Georgia Bigfoot hoax.