7. Always Think On Your Feet (Dial M For Murder, 1954)
No matter how diabolically intricate and well-crafted your plan, life has a way of throwing a spanner in the works. That being the case, always be prepared to improvise a new scenario off the cuff. In Dial M For Murder, dear sweet husband Tony blackmails an old acquaintance into murdering his wife Margot... but in a shocking twist she kills her would-be assassin instead. Believing it to be a robbery gone wrong, Margot calls her husband for help - and Tony, thinking on his feet, plants evidence so that his wife is convicted of this unexpected crime. Its this kind of genius level gift for improvisation youll need if your peerless plan becomes riddled with holes.