I didn't invent this game, but it's quite popular back where I come from.
This game is played by posting an image which can "beat" the previous image. For example, the first poster could post a spider, the next poster could then post a flamethrower, and the third poster could post a water hose. Note that poster #3 does not have to beat poster #1, just poster #2.
Load up Google Images and let's get started!
First image:

































































































