What's the worst that could happen?

I watched the the TEDtalk - Tim Ferriss : Smash fear, learn anything. This talk focused around what my research paper will be about, fear, but this talk is more say about how to fight the fear and not about what fear is. Smash fear, learn anything started off with Tim showing a photo of himself - young and wanting to be mr strong and the Incredible Hulk, telling a story of how he would run into his family room tear up the couch and run out. Being mr tuff until age seven he says, when at camp he dove into an inter-tube and a bully kept him underwater. Creating his fear of swimming and realizing he was not the Incredible Hulk he once thought he was. His stories don't keep going, he fast-forwards to his age now (31)  and how he has re looked at swimming, looking at all the in's and out's. And he tried to concur his fear; first by just swimming a lap, and then getting to a point where he swam out into open ocean and back and when he stepped out he had that Incredible Hulk feeling back. 

Taking apart fear and making it into just questions and facts and knowledge to then not be afraid is the whole point. Fear is a natural part of our bodies, we are born with fear in us just like organs. First forget about what your doing, like in swimming, kicking, forget that your are kicking, forget about anything that you do while swimming. But what if you're not afraid to swim but your afraid of not knowing all the knowledge the world has (like language). Gaining a system that you know and learned your original language with. His final concurred fear was performance, or dancing is what he uses. He put himself into a situation where he was going to watch dancers, but then was pulled in. After being humiliated by his partner, he just went into it and then broke down each dancer he could find and each way of dance he was taught, even though it was all tango dance it was taught to him in different ways of different instructors in their own way. 

Yes, I didn't really get what the three topics he was fear-full of to speak of and talk about how he fought them. But then I got it, these are pretty common fears for people - water, knowledge, and performance.

So forgetting, comparing, and just throwing himself into something made the fear go away. Cause what is really the worst thing that could happen?