What makes assassins so cool? Is it their grace under pressure? Canny sense of style? Or is it just - in true GTA-style - the vicarious thrill of watching a cold-blooded sumbitch put a blunt one through someone's forehead? Well, the movies love assassins as well, having rattled them on screen like an AK pumps bullets. With Keanu Reeves' hit man thriller John Wick opening this Friday, we thought it's time to set our sights on the coolest contract killers in the movies. "Who the hell was he?" asks the confounded cops of the man who would kill French President Charles de Gaulle.