Tonight (08/10) at 12:30am EST, The Conan O'Brien Show airs on NBC. And on this evening's show, Slipknot will be performing the track "Left Behind", off their upcoming IOWA release. Tune in, you have no excuses for not watching (unless of course this is past your bedtime)...hell, NBC is national TV...even my grandmother, with here rabbit ear antenna, gets NBC. Tonight. NBC. 12:30am EST. The Conan O'Brien Show. Live Slipknot performance.