Jeb Corliss "Grinding The Crack". Well, what on earth does that mean? What starts out as a fairly normal (!) base jumping video suddenly makes one's jaw drop, from about 1 minute 19 seconds in. There are a LOT of comments about his testicular fortitude and you will see why... As usual with videos of this nature, it's best to click through to the Youtube page and watch it in full screen high definition. It’s anyone’s guess how long Jeb has for this world.