Rory, what did you think they wanted me for? Conceived mid-flight through the time vortex. My mother grew up with time and universal energy pouring into her head from the crack in her wall and you - how many times did you die and come back? You're practically a walking paradox, Rory.

[She doesn't mean to sound harsh, but these are the cold hard facts]

The Doctor, his people became who they were by contact with the untempered time vortex schism on Gallifrey. You two managed to cook up the closest thing to a Time Lord this universe has seen in a long time.