I haven't seen this here yet, or then I'm just a bad searcher. Lets give it a go! It gets funny if people are creative
Basically I start the thread by finding a picture that contains number one, or "one of something" and post it here. Second poster should google for number two and choose a suitable picture that has the number somewhere. Doesn't have to be a number, could be 2 trees instead for example. Third poster looks up for three....
Let's see how far we can count!