Shane Black wrote Lethal Weapon at twenty-two and became the highest-paid screenwriter in Hollywood before directing anything. The voice is immediately identifiable: banter under pressure, narrators who admit they are narrating, and structural jokes about the kind of film you are watching.
Kiss Kiss Bang Bang was his directing debut and is the fullest version of it. Iron Man 3 brought the same sensibility into Marvel and produced the most divisive twist in the series, which he has defended consistently.
Almost everything he has written or directed is set at Christmas, which began as a way to make a familiar setting strange and has become a signature.