You're a real hoot
How about some "fun fact for trivia"? If the card contains an expression such as "you're a real hoot", what is the origin of the expression. This could be a "FUN FACT" on the back of the card. If you looked through a book on idioms you would probably find hundreds of these little sayings you have heard before. If you can draw something depicting the saying like on this card, the owl, you might be able to come up with a whole line of cards that have these fun facts on the back.
~Bill McAuley
