Usually, hypnosis gets a bad rap for what it could do. Most of the time, people get a lot of what it can do completely incorrect though. Hypnosis cannot make someone do something that they do not actually want to do. Even the best hypnotists in world history could not force someone to do something they didn’t want to do. Therefore, none today could do this either.
Let’s pretend, however, that a hypnotist wants people to become zombie-like figures. They’ll try to hypnotize people and those who want to be zombie-like figures join this man on his mission. While hypnosis is only part of what led them to this, they truly wanted to do it too. The hypnosis just brought it out of them. Either way, it still fits the situation and a real zombie apocalypse could be possible if this is done on the right people around the world.