Quote from Monica in The One with the Chicken Pox
Monica: You know what, tomorrow, I'm gonna do your clocks. Richard: You're gonna do what to my clocks? Monica: I'm going to set them to my time. Richard: Well, I'm confused. I thought we shared time. Monica: No. No. See, in my bedroom I set my clock six minutes fast. You wanna know why? Richard: Because it's in a slightly different time zone than the kitchen?