One of the things I find so amazing at Burning Man is the the sheer volume of serendipitous things that occur there. In 2011 I witnessed several, but this year (2012) I was directly involved in one.
One morning I exited the portos to see a neighbor (Playa Name - The Captain) standing there wearing propellor pasties spinning away in the breeze. After telling him I had seen those on Etsy a few weeks before, he informed me that he invented them and that was his Etsy store.
Turns out we are in each other's Etsy circles and ended up camped about 20 feet apart in the same village on the playa.