As the movie's star has recounted, among the many injuries Johnny Knoxville suffered while filming his new comedy Action Point were concussions, broken bones, and the loss of “two-and-a-half teeth.” Did they happen to be his fangs? I ask because director Tim Kirkby's stunt-filled slapstick, despite its expected R rating, is about as close to a family-friendly Jackass as Knoxville has attempted, and I don't mean that admiringly; even before its famously fearless, possibly deranged lead walked on set, this thing was destined to be toothless.