No matter what precautions you take, or how well prepared you are, one day an accident will hapen. If you are lucky, it will just mean some time in the hospital. This is incredibly foolish - it's about the equivalent of closing your eyes for ten seconds while driving on the highway. Many time someone can get away with this, but if the snake decides to tighten it's grip, it can cut off the blood flow to the brain and render you unconcious, or even dead. The worst part of it is that the snake is covering such a large area of the neck that the pressure is hardly felt.
Snakes are amazingly strong.
Consider the fact that virtually every muscle in their body can be used for constricting when they decide to. If you want a snake to impress your friends, or shock your inlaws, then do us all a favor and just dye your hair orange or get your eyelids pierced or something. A snake is a living, intelligent creature that has as much right as any animal to live comfortably and securely. Unqualified or uncaring snake owners are the ones that we read about in the papers, and make the public at large wary of snakes and those who keep them.