To be completely honest, I'm horrible at making plans as it is. Even for things I know are going to happen. So, if something that unexpected and out of the ordinary were to happen, I would be completely dumbfounded. Don't get me wrong, I'd be absolutely ecstatic, but I'd have no clue what to do. In fact, I'd probably just faint and eventually make my way to Twilight's library somehow after several hours of being comatose.
As for what I'd be... I'm not sure. Judging by what my talents are, I'd probably be more useful as a unicorn but on the other hand, Pegasi can friggin fly! So, once again, undecided.