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I’m not sure we’re thinking of the same hypothetical here…
I’m saying if you bring chicken to the cinema, and the staff (citizens) arrest you for it, they are beyond wrong. Because it’s oviously not illegal to bring chicken to the cinema, only against policy and therefore it would be false imprisonment.
All they can really do is ask you to leave, and if you don’t they can call the police, or maybe, depending on the law in that jurisdiction, they could then legally detain you for said trespassing. But certainly not for breaking their policy in the first place.