Quote from Joey in The One Where Rachel Tells...
Joey: Why would they take our keys? Phoebe: Maybe they don't trust us. Joey: No, that's not it. They let me keep my key the last time they were out of town. Phoebe: You mean the time you broke the ketchup bottle and cleaned it up with Monica's guest towels? Joey: Hey, I washed those. Phoebe: No, you didn't. Joey: Yeah, that didn't sound like me.