It has never been more popular to be a zombie than right now, but a new PSA from the Heart and Stroke Foundation on how to practice CPR shows bringing people back from the dead isn't impossible. Set in a post-apocalyptic city, one lone woman is left to fend for herself against an army of the undead. It's too much for her to take, and she keels over from cardiac arrest. That's when these zombies get to work. They stop their approach to whip out their cell phones, call 911 and successfully revive the woman with some chest compressions. Only then, after saving her, do they decide it's time to feast on her brains. Hunting the living is the best part.