Every tenth poster can change this thread's subject, so if 30 people post in this thread then the 10th, 20th, and 30th poster can change the thread's subject. If they fail to change the thread's subject, the immediate poster after them can change the thread's subject instead. If that person also fails to do so, the person after them can change it and so on until someone changes it.
But besides those cases you must post based on the current tenth poster's subject of this thread. I am the exception to this rule since I'm the first poster.
Current Thread Subject: OLD SCHOOL MEMES YOU STILL LOVE.