Leave It to Beaver (1957)

S3E29 Beaver's Monkey

Beaver decides he wants a pet, but when Ward and June disapprove of his choice—a mouse—they suggest he consider a more practical option. While at the market, Beaver and Larry spot an ad offering a free monkey, and Beaver eagerly seizes the opportunity. Soon enough, Ward and June find themselves welcoming Stanley, the monkey, into their home, much to their surprise.