I have passed on a shot far more often than not. The most notable was the regular season opener here 5 or 6 years ago. After spending 6-9 am in a tree I had convinced myself it was a bust and started back to the house; halfway there a nice buck stood up at 40 yds or so, facing away from me, and shook the dew off which caught the sun and formed a mini rainbow just above his back. I really couldn't envision sending a slug his way just as he was waking up, so I stood. He finally did glance my way before trotting off . I've never regretted that.