Yup it happens to all of us. Afew years ago I was out with a friend new to hunting and I had an unbelievable opportunity at one of the bigger WT bucks I have seen around here. Was calm enough, set up on a tree as a rest, he was maybe 80 yards away. I gently flicked the safety off like I knew what I was doing, squeezed and click! Quickly racked another but I was flustered then and buck was gone. Felt like a complete idiot. I always double or triple check my rifle is unloaded when it's supposed to be, but some how I didn't do the same when it needed to be loaded and ready. For what it's worth my buddy still chuckles at that experience.
KO