Re: WISH TIME
[Well, to be fair, I did just remember the paradox thing.]
Time. Machine. Time Machine with Amy Pond and the Doctor and I haven't even fully described how bloody mad he is.
Do you think for a moment they could run around time and not change things?
There's a Paradox Protection in the TARDIS. Time can be totally rewritten, but you'll always remember what really happened. Global disasters averted, your parents never met, you stole all your own eggs that one time you were five and wanted eggs. No matter what happens in time, you wouldn't change until you reach the point where things are falling apart in the very fabric of the universe and even then, it's not complete.