Judge Thomas Spangler – the catalyst at the centre of Woody Allen’s latest dark-comedy, Irrational Man – is a creature of habit. Every day he jogs along the same route, drinks the same juice and stops to read the paper on the same park bench. His routine is, in fact, so constant and predictable that it actively plays a part in his own demise. Allen, too, follows a predictable routine. He exercises in the mornings, writes at the same desk all day, and watches baseball at the weekends. He once famously missed an Academy Awards ceremony because it clashed with…