Having watched what happened to MSNBC primetime star Lawrence O'Donnell when someone leaked footage of him having an on-camera meltdown during a glitch-riddled taping, CBS late-night star Stephen Colbert decided to get out in front of his own similar embarrassing Late Show incident. In video leaked this week, The Last Word anchor was seen grimacing, swearing, thumping his desk, jumping out of his chair, and otherwise losing his cool when the “insanity” begins. “Who is…