Igor and the Lunatics (1985) 
First thought: I am unable to explain why this film has a post-apocalyptic style poster when it is in fact about a hippie cult and their fanatical leader.
However this mild pondering aside, Igor and the Lunatics doesn't really gel at all well as a film so I guess they needed to market it any way they could. Troma seems to have 'remixed' the film, possibly in an attempt to bulk-out the running time by repeating certain key scenes either as flashback or part of the story told/seen from different perspectives meaning that if you actually look all the elements from the film, you begin to realise that nothing much really happens. Maybe they ran out of film and had to work with what they had... either way there isn't much to recommend about Igor and the Lunatics unfortunately.
Oh, a mannequin called Sarah is circular sawed to 'death' but you get to see this a few times during the film from a few different angles so it's hard to get too excited about it.