I'm sure this "don't touch the cue ball" rule has been around for longer than I can remember, but I don't recall its ever affecting a match until Karl Boyes invoked it against Shannon Daulton in the 2015 U. S. Open, on a ball that OBVIOUSLY WASN'T GOING TO SCRATCH. Daulton was comfortably ahead at the time, but the nitty call unnerved him, and IIRC he didn't win another game. I realize that rules often have to override common sense, and I understand the reason for this particular rule, but in some cases a nit call is just a nit call. It's on a par with the time Efren was called out for not calling a 10 ball on a straight in shot that was about 2 ft. from the pocket, a shot he makes 1000 times out of 1000.