The Dick Van Dyke Show S01E25 - Where You Been, Fassbinder?

The Dick Van Dyke Show (1961)
S01E25 Where You Been, Fassbinder?
Episode Overview
Sally realizes she has no one to celebrate her birthday with, but then receives a call from an old high school friend, Leo Fassbinder. Excited, she invites Leo over for a low-key celebration at her apartment. Meanwhile, Rob, Laura, Buddy, and Mel are skeptical about Leo's existence, suspecting he's just an imaginary friend. They decide to throw a raucous party at Sally’s place, completely unaware of her plans for a quiet night with Leo.