You post something that excels in something (like for example cuteness, coolness, awesomeness, bloodyness, etc.) and the next poster would have to post something else that tops it in that department. Then he'll post something else that excels in something else and the next poster does the same.
Start!
Most absurd fight scene:
https://www.youtube.com/watch?v=3WTOP2BH_p8
Start!
Most absurd fight scene:
https://www.youtube.com/watch?v=3WTOP2BH_p8