I often get them when I'm shooting and last Thanksgiving and Christmas, my uncle let me shoot his.50 BMG. I wish I could post the video of me shooting it, but it won't let me, lol, so the screenshot of the video is the best I've got. I still had my PICC line in at the time, but with the giant ass muzzle break on there and the roughly 27 pounds that the rifle weighed, and the line is on my left arm and I'm right handed, it was quite safe. My adrenaline was pulsating the entire time and my heart stopped when I fired it. It was by far the loudest gun I've ever shot in my life and I don't know if I even hit the target because I couldn't keep my eyes open when shooting it, lol, so I just scoped in and once I was on target, I moved my head away from it, held it as steady as I could, and fired. When do you get an adrenaline rush?