There are many memes when it comes to Doritos. Everyone has heard of Dorito dust for example - some people even purchase the thing on auction sites like eBay. Well, no one has ever seen a Dorito fail like this. How is it even possible for a weird, irregular object as a Dorito chip to stand on its own? By all measures, something like this has to be impossible.
The person that posted this photo that they the Dorito had fallen out of their hand by accident, and this is how it landed. The photo was not being set up - this thing literally happened. One possible way how this could happen is if a larger part of the Dorito is on the left side, making it balance the curve it has on the right side of the chip.