Lead Balloon (2006)

Having accepted funding from the local council, Rick reluctantly agrees to teach a Stand-up Comedy Workshop in Belford Prison. But this turns out to be one of Rick's worst gigs: he is taken hostage, trapped in the prison library by a knife-wielding prisoner, Donald. Donald is a worrying mixture of charming and psychotic - and worse still for Rick, has a pathological hatred of liars. Can Rick talk his way out of trouble? Will the governors give in to Donald's demands? Or will this be the end of Rick's less-than-stellar career?