4th wall: The wall between the characters and the audience.
5th wall: The wall between the set and the basement.
6th wall: The wall between this show and the sitcom that’s filming upstairs.
7th wall: The wall between today and yesterday when our show got picked up.
8th wall: The wall in our writer’s room where we pitch season-long story arcs on the whiteboard.
9th wall: The wall between our writer’s room and the writer’s room for that sitcom, which is not very soundproof and makes it very hard to concentrate.
10th wall: The wall between right now and this morning when we rushed to finish rewriting the pilot with notes from the studio executives.
11th wall: The wall between today and tomorrow when we’ll be canceled.
12th wall: The wall between this universe and a parallel universe where our show isn’t canceled.
13th wall: The wall between that parallel universe and another parallel universe where our show is not canceled, is critically acclaimed, and is watched by millions of viewers every week.
14th wall: The wall between that other parallel universe and yet another parallel universe where our show is not canceled, is critically acclaimed, is watched by millions of viewers every week, and where that sitcom is canceled instead.
15th wall: The wall between this studio lot and the outside world where people actually contribute to society instead of trying to make a living as a television writer who is resentful and jealous of the writers on successful sitcoms that are only popular because they pander to the lowest common denominator and have lots of fart jokes.
16th wall: The wall between the outside world and the joke store across the street where we’ll buy whoopee cushions for our next show.