In Friends Season 3 Episode 22 there's the following scene:
[Scene: Monica and Rachel's, Monica and Rachel are returning. Phoebe is still on hold.]
Phoebe: Oh, is the play over?
Monica: Yeah. Where were you?
Hold Voice: Thank you for your patience, you’re the next caller.
Monica: You were the next caller five hours ago. You must be going crazy.
Phoebe: Nah. I kept myself busy.
(Both Rachel and Monica walk into their bedrooms, stop, and come back into the living room with confused looks on their faces.)
Phoebe: Oh, okay, yeah. (to Monica) I put your stuff in her room, and her stuff in your room.
(They both look at each other, nod their heads ‘All right’ and follow their stuff into their new rooms.)
Phoebe was near the phone on hold near to the phone all the time, how? And what is the point of doing something so bizarre like changing the stuff of people into other rooms?