Quote from Frasier in No Sex Please, We're Skittish
Daphne: We're very excited. Niles: Yes, we were up half the night imagining life with our first child. Frasier: Yes, well, first child you know about. Daphne: What does that mean? Frasier: Hmm? Oh, it's not what you think, Daphne. I was just referring to the time when Niles sold his sperm to a sperm bank. Surely you told her about it. [Niles gives Frasier a flustered look] Off I go.