Too Close for Comfort (1980)

S2E22 Don't Shoot the Piano Movers

April receives a baby grand piano from her father and decides to accept Monroe's offer to help move it into her apartment, enlisting a big friend for $20. However, things take a turn when they find themselves stuck inside the apartment just as Muriel starts experiencing labor pains, while Henry's recently married friend grows increasingly frantic about being reunited with his wife.