So what would you do if you were suddenly pulled into another world? Panic? Scream? Punch the nearest thing thing you saw in the face? All of the above? Oh dear. That was Celestia. You just punched Celestia in the face.
Better run for it, she looks mad.
A quick story inspired by a prompt from PonyPon over on Derpibooru. Exactly what it says on the tin.
The only warning is that the narrator is a human, and there is a small bit of cursing.