You all know what happened on that fateful Summer Solstice a few years back, the dramatic tale of our favorite sextet of friends fighting an evil force trying to bring about eternal night and the loving reunion of sisters long parted. That tale is common knowledge. What you don't know is why. I mean, sure. You've got an ambiguous legend involving harmonic elements and a thousand year banishment to the moon, but who actually believes that? The truth is much more mundane. Celestia didn't banish her sister because of a spat over when the moon should be in the sky. That's far too dramatic. The truth is much simpler. It was over a taco stand.