So yeah, the title says it all.
All you have to do is tell the person above you that they're banned for something, and this happens over and over... It's really fun, though I make it sound boring XD. I'll give you an example.
(Person 1 has just posted)
Person 2: Banned for having Person 1 as your username!
Person 1: Banned because it's an awesome username!
Person 2: Banned because Rue is awesome!
Person 1: Banned because that is so true!
...
And it continues!