Slacklining is a hobby for the crazy. And this video is 100% unadulterated insanity. In this death-defying stunt, daredevil (a.k.a. extremely gutsy and talented nut job) Spencer Seabrooke tries to cross a 210-feet gap and make it to the other side without losing his balance and finding his brains splattered all over the ground below (which is a good 950 feet away from him). One of those things actually happens in this video. Watch it to find out which one.