Someone says something and the poster below them posts a picture of their reaction to the previous poster's statement. Or you could mix it up and post a reaction picture to a reaction picture.
Example:
MacPhantom:
Obama is the best president ever in the history of everything.
Spookymufu:
![Image](http://img38.imagefra.me/i57q/cfh2558/14ax_ef8_uc47a.jpg)
K, I'll start.
My statement is.... Women are horrible drivers.