Many DBAs moving up through the ranks have "nerves of steel" until the get bitten once or twice... It can happen doing any activity.

Many years ago I had a sky diving instructor that was also a good personal friend. After I got out of my "tumbling across the sky, screaming, out-of-control stage" of skydiving proficiency, I noticed that he went back to basics and was continuously badgering me on maintaining fundamental best practices.

I asked him why he was going back to basics with me. I stated that I knew this stuff already, I could do almost everything they could do and I wanted to move forward and start flying formations and becoming a junior sky god. His comment was "Students have a tendency to get cocky at this stage. When you start this sport, you pay attention because its new to you. When you have been doing it for years, you have obtained a healthy respect for safety. It is the stage that is in-between those two where you think you can do no wrong. That's when you'll make a mistake. I do this with everyone. I'm spending more time with you because you're too darn sure of yourself." After more time in the sport, I understood what he meant.

There is a time in all DBA's learning and experience curves that parallel's my old instructor's theory. You learn how dangerous some of the commands are that we do through experience. Some experiences are good and some are bad.