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They are either having a very good time — with much laughter and banter, and perhaps a tear or two when a butterfly emerges from the cocoon — or else they are excellent actors.

He also targeted fellow taxi drivers, shooting three and killing one, Darren Rewcastle, at a rank in Whitehaven in warped revenge for having been the butt of their jokes and banter.

He points out that, while the chanting was widely condemned, "to some people it might be viewed as acceptable banter".

In fact, it said they had observed staff engaging prisoners in "cheerful but respectful light-hearted banter".

Industry publication Screen Daily said the film was "shot, one suspects, with a touch of guerrilla ingenuity... Last Swim also has a palpably improvised component in the friends' genially pitched running banter."