鲑鱼

The plot: at a wedding, a repellent family of affluent Spaniards feasts on trout that has gone a bit off. (A cultural studies perfesser would certainly note that there is a foreshadowing here of the decomposition motif in "A Z and Two Noughts".) As I recall, everybody dies at the end, and no-one makes the "but I didn't HAVE the trout" joke.