Documentary subjects don't come much more niche than this, and the history of Dublin's skateboarding scene feels stretched at feature length. One suspects the participation of US legend Tony Hawk is the only reason it happened. At the centre of the scene is Clive Rowen, whose skate shop became the mecca for a subculture that had its work cut out, what with local gangs, unsympathetic officials and a lack of equipment or facilities. Interviewees' stories start to overlap, and there are only so many ollie flips you can watch.