I have an old posting worthy of revisiting, updated. So do please now find it here: Joker Copycats: 2008-2012. Those essays were first posted in January and March, 2009. They have been moved to a more recent location and revised, in the wake of the Aurora events of July 20, 2012.
"If coincidences are just coincidences, why do they feel so contrived?" ~ Special Agent Fox Mulder, X-Files, "Clyde Bruckman's Final Repose," 1996.