TV writer Leonard Stern, who co-created Mad Libs in 1958, recently passed away at the age of 88. His wacky wordplay creation has sold more than 110 million copies of the books in the series.

Related Fact: Included in the Mad Libs catalog are a series of adult versions with subjects like Dysfunctional Family Therapy, Advice for the Lovelorn and Bachelorette Bash.

[Sources: Flavorwire and Amazon. See previous Numbers of the Day here. ]