Grylls Portal

Bear Grylls, and the creation of the Grylls Portal
The phenomenon we have come to know as the Grylls Portal occured when legendary survivalist Bear Grylls came up with a final solution to all his piss-drinking needs. This solution came in the form of him curling up in the foetal position, inserting his phallus into his own mouth, and then pissing rapidly. This incredible display caused a constant circulation of piss moving faster and faster, akin to the movement of particles within the Hadron Collider. After approximately 3 hours (citation needed) the piss was travelling so fast that it ripped a hole in the space-time continuum, opening the Grylls Portal which lead to Equestria. This is the portal that led to GeorgeTron and Optimus Plum up in Equestria.

What happened to Bear
It is, at present, largely unkown as to what actually happened to the physical form of Bear Grylls in this process, some speculate that he was tossed into an entirely different dimension, while others believe he was transported to the Bedroom of Noel Edmonds to be eternally raped for his crime against the universe. Most, however agree that he was merely destroyed in the metaphysical combustion that resulted in the Equestria-Earth Void.