Think I saw one of those Red Triangle films, or part of one. IIRC had a similar premise To The Idiots, but instead of pretending to be disabled, this fella is pretending to be a caveman. Can’t remember much of a it, apart from a policeman being killed and eaten. It might have been French.
I’ve probably conflated more than one film here, cos I saw bits of films like in snatches cos I wasn’t supposed to be watching it and my mum would sometimes interrupt me when she couldn’t sleep and came downstairs to make a camomile tea.
Wow, haven’t thought about that in years