COO-COO is a party game published in 1921. Players punch out a hole in the pegboard using a metal "key." A little wad of paper is pushed out, which when unrolled reveals a slip containing some stunt the player must perform. Each pegboard contains 100 stunts.
Players take turns choosing a ball and adding it to CooCoo the Clown. You must be careful not to throw him off balance and make the balls tumble down as the curved feet send him rocking.
Coocoo, the Rocking Clown, just loves to juggle, but his big curved green shoes make him wobble and keep throwing him off balance. Help him juggle the most balls without making any of them fall, and you win.