Val Thomas - No brain waves for 17 hours, being "preserved" with a ventilator in order to keep the organs healthy for "harvesting" and transplant ---- then suddenly, she's  moving and talking!

From the article:

"This supposedly “brain dead” woman was actually alive, even tough doctors were not capable of detecting her brain activity. Ironically, it was the decision to keep her on life-support for organ preservation that ultimately saved her. If the surgery had proceeded, Val would have died a real death because of organ removal (… not from so-called “brain death”)."

Full article link:  http://www.organfacts.net/notdead/val-thomas/