It's the conundrum that faces all television personalities broadcasting live: how to deal with hecklers trying to disrupt the show. Do you ignore the perpetrators? Do you try to reason with them? Or do you do what the American comic and talk show host Bill Maher did - jump into the audience, threaten the hecklers with an ass kicking" and scream "Get the fuck out of my building!" In one of the more unconventional displays of audience interaction on US television in recent years, that is now doing hot trade as a clip on YouTube, Maher reacted to the interruptions of hecklers in his studio audience with the memorable words: "Do we have some fucking security in this building?" He then tore off his lapel microphone and stormed off the stage and up to some protesters wielding "expose the 9/11 cover-up" banners. It was at that point during a panel discussion on his HBO show, Real Time With Bill Maher, that the nature of the comic's difficulties with an element of his audience became clear. Maher is a darling of the US liberal intelligentsia for his brand of Bush-bashing and anti-religious pedantry. But the one point over which he will not bash the Bush administration is the events of September 11 2001. He does not agree with 9/11 conspiracy theorists, or Truthers as they call themselves, that the Bush administration brought down the Twin Towers in a controlled explosion. The trouble started a few weeks ago when Maher launched a verbal assault on air against the Truthers, calling them "crazy people". He advised the conspiracy theorists, who had been demonstrating outside his studio, to visit their doctor to ask whether the antidepressant Paxil was right for them. In 2002 ABC ended its relationship with him over comments he made in his former show, Politically Incorrect, about the 9/11 hijackers.