Elliot: What's with the second beeper?
Turk: Carla gave it to me. She's got me on 24-hour baby-making alert. We haven't had sex since her last ovulation. Did you know women only do that once a month?
J.D.: Of course I knew that, Turk. I'm a doctor.
J.D.: [v.o.] Once a month? That's crazy!