Even if Conan O'Brien were "Legally Prohibited from Being Funny on Television"--the official name of the 2010 tour featured in the documentary "Conan O'Brien Can't Stop", he'd happily be a scofflaw. Longtime TV director Rodman Flender ("Ugly Betty") captures both O'Brien's spontaneous humor in his standup comic tour around the United States, but also his rage. O'Brien briefly replaced Jay Leno as host of NBC's "The Tonight Show", but ratings for the show plummeted. So NBC dropped O'Brien, and O'Brien got his revenge by selling out shows in 32 cities, featuring equal parts standup, monologue, and screed against NBC. "If there's ever been a time in my life when I could say 'the hell with it,' it would be now," O'Brien says early in the film, setting up his rage as well as finding a pretty good outlet for it. Those who wonder if there's a healthy--or even unhealthy--dose of anger behind most standup comics will see the answer in a largely unguarded O'Brien, captured with raw honesty by Flender, in "Conan O'Brien Can't Stop". O'Brien is also joined at various points of the tour by Jim Carrey, Andy Richter, Steve Kroft of "60 Minutes" (who gets an earful), Eddie Vedder, and others. And O'Brien does manage to be pretty funny, mostly in off-the cuff moments. But "Conan O'Brien Can't Stop" is notable mostly for O'Brien's willingness to be shown as the pot lid is starting to blow off the boiling pan. And that makes for incredibly gripping viewing. --"A.T. Hurley"