Revenge

Frasier: You know the expression, "Living well is the best revenge?"
Niles: It's a wonderful expression. Just don't know how true it is. Don't see it turning up in a lot of opera plots. "Ludwig, maddened by the poisoning of his entire family, wreaks vengeance on Gunther in the third act by living well."
Frasier: All right, Niles. [heads into the kitchen]
Niles: [follows him] "Whereupon Woton, upon discovering his deception, wreaks vengeance on Gunther in the third act again by living even better than the Duke."