'The Simpsons' (Sun., 8PM ET on Fox) has seen its share of relationship problems. Generally, these conflicts revolve around the eternally kind-of-troubled marriage between Homer and Marge Simpson. But suddenly, three characters find out at the same time that their marriages could be over.

[Spoiler alert.]

Bartender Moe sends a letter to three Springfield husbands, telling them that he's leaving town forever ... and is taking one of their wives with him. Now, Homer, Apu and Reverend Lovejoy have to solve the mystery. Will one of their wives be leaving with Moe? It's an extended parody of the classic film 'A Letter to Three Wives.' And it's good stuff.