Along the same lines, it makes people think cpr is some magical cure that brings people back from death. It is not, it is literally squishing blood through the body manually after the heart has stopped to try and buy time for health professionals to get there to institute advanced life support and intensive care (ie with life support machines) in case there is some reversible problem. The vast majority of the time a person getting cpr stays dead, especially if it occurs outside the hospital. And for the people that do make it there is usually brain damage.

This makes talking about the reality of dnr orders and things tough because people think they're saying no to some miraculous cure instead of a violent temporizer in case someone is dying of something reversible, and has no applicability to their irreversible disease.