Mad About You (1992)

S2E23 Up All Night

Jamie can’t seem to get any sleep after downing four cups of caffeinated tea while cramming for a test. Frustrated, she convinces Paul to stay up with her, and they embark on a spontaneous all-nighter exploring the building, from the basement to the rooftop. Their wild adventure takes an unexpected turn when they end up dancing the tango with a man who claims to be John Astin—though Jamie and Paul aren’t entirely sure he’s the real deal.