Conspiracies are also used in affairs of the heart. Lets say a middle aged bloke gets involved with a much younger woman who he works with on a film set and everything is fine and kept under wraps. Then this older bloke finds she wants to leave him for a guy she works with on the same film stage. He goes crazy and concocts a way to murder both using a gun prop. Ive seen it used on a Columbo episode with William Shatner