“Hangman” (*1/2 out of four) was a wretched horror thriller about two homicide detectives (Al Pacino and Karl Urban) who try to track down and piece together the murders of a brutal serial killer whose crimes are inspired by the game Hangman of which there doesn’t appear there will be any survivors left. Pacino is at his hammy worst and Urban is dull; why these two signed on for this dreary and ugly thriller (which liberally rips off “Seven”) is a bigger mystery than who the murderer is. A Southern accent is simply not to Pacino’s advantage.