Quote from Roz in Duke's, We Hardly Knew Ye
Roz: The way I see it, your situation is like a woman who has one crazy night and cheats on her boyfriend. And the only reason for this woman to confess is to make herself feel better. The best thing she can do is just keep her mouth shut. Unless, of course, her boyfriend walks in on her and the other guy because he decides to come home from Portland on the midnight flight instead of driving back like he said he would, so in that case, he's the liar and why should she feel bad?!
Frasier: Thank you, Roz, for that purely theoretical example.