Deathgasm (DIR. Jason Lei Howden) By: Shahbaz Khayambashi Think to yourself for one moment: what do you imagine when you think of a film entitled Deathgasm?  Jason Lei Howden’s film is basically that. The plot is simple enough: four teenage New Zealand metalheads decide to form a band, after sneaking into a Varg Vikernes stand-in’s house and coming into possession of music and lyrics to a demonic song which turns the inhabitants of their small town…