America's popular corporation-basher Michael Moore (Roger and Me, The Big One) is in characteristically pugnacious form in this award-winning attack on America's culture of guns and violence.

The title of the film comes from the Columbine massacre when in April 20 1999 a couple of school boys went bowling and then went on a rampage in which they killed 12 of their fellow pupils, a teacher and themselves.

Taking Columbine as a starting point Moore tries to extrapolate the reasons behind America's violent love affair with guns. His argument, vividly animated in an amusing South Park style revisionist history lesson, that America's problem is fear not lack of gun-control, is not always convincing but it makes for an eye-opening, sometimes chilling and acerbically amusing ride.