What is it?
Clues:
1) You use it to have fun.
2) It was banned from the early 1940s to mid-1970s in most of America’s big cities, including New York, Los Angeles and Chicago. The stated reason for the ban was it was considered to be a form of gambling.
3) It used to be called The Whiffle Board.
4) If you were me, it would be one of your top 3 favourite pub games.