When you think about the jolly figure of Santa Claus, it's probably fair to say that jiu-jitsu isn't something that comes to mind straight away. What about Greco-Roman wrestling?Well those are the skills that David Harbour had to learn while preparing to play a less-than-jolly-old Saint Nick in director Tommy Wirkola's festive action movie Violent Night.Violent Night will be released in UK cinemas on 2 December.