Northern Ireland's comedians are daring to make fun of Ulster's sectarian divide. Finding time to laugh at themselves and their problems may be seen as bad taste but it is also, it seems, a necessary safety valve. Omnibus takes a trip round Belfast and its environs in the company of Belfast-born comedian Frank Carson and local acts like the satirical group the Hole in the Wall Gang, Ulster's very own housewife-superstar May McFettridge, and impressionist John McBlane.