Quote from Daphne in No Sex Please, We're Skittish
Daphne: I took the test today, I'm ovulating. Niles: Oh... well, in that case, the last one upstairs. [Daphne follows Niles as he rushes upstairs Niles: Uh, Daph, this isn't the ovulation kit. It's the pregnancy test. Daphne: Oh, silly me. They look so much ali- Niles: We're pregnant. Daphne: Oh, my God, we are, aren't we? Niles: But my slow sperm. Daphne: I must have fast eggs.