Pooping with markers

I found the 2 butts on that stall door.

Saw this on Sparknotes.

Omg. Sing a duet!

Finally! I found the 2 butts!! :)

I CAN SHOW YOU THE WORLD,
SHINING, SHIMMERING, SPLENDID-

On the 'bad move, O" it's noughts turn.

Is one of them upside down?