The Flintstones S02E21 - Impractical Joker

Barney gets even with Fred because of his practical jokes he's been pulling on him from time after time, so Barney pretends to be a counterfeiter in his basement with his $500 bills of money he won in a slogan contest and Fred thinks the money is fake and will land him in jail. Meanwhile, Wilma and Betty try to cure the both of them of their practical jokes.