Monica and Chandler are secretly dating. They don't want anyone to know, so they have to sneek around. It's very early in the morning. Monica and Chandler are walking through the apartment quietly, not to wake up Joey. Just before Monica sneeks back to her place, Joey walks out. They convince him that is like 9am, so he says he better start getting ready and goes into the bathroom. Chandler takes Monica over to the bathroom and opens the door. Right there, in front of the door, Joey is sitting on the toilet asleep. In EVERY other episode when their bathroom is shown, with the door open, all you can see is the shower. The toilet is behind the door.