It's Garry Shandling's Show (1986)

S04E10 The Honeymoon Show

When a string of bizarre fatalities occurs, the Shandling couple begins to suspect their union might be jinxed. They grapple with the unsettling notion that their marital bliss could be overshadowed by a sinister force, leading them down a path of mystery and paranoia as they try to uncover the truth behind these strange occurrences. As they navigate their new life together, the couple must confront their fears and work to break the supposed curse that hangs over their honeymoon phase.