Severed heads. Geysers of bodily-fluid. A ‘cuttlefish’ doubling as an alien penis. For 36 years, GWAR have thrived as oddball outsiders, blurring the line between shock rock and absurdist theatre. To celebrate documentary This Is GWAR, we find out why The Scumdogs Of The Universe – and their fanbase of ‘Bohabs’ – keep coming back for more…