A close friend of mine just got out of the hospital after dropping himself out of the stand. His stand was about 25 feet up in the tree. He said it was a homemade stand but he had purchased a seat for it. As he was trying to hitch up his safety harness, the seat gave way and down he went. He managed to struggle a mile through the woods to his vehicle and his cell phone where he called his son and told him he needed his help. He thought he was dying. His son managed to phone the paramedics and lead them to his dad. End result...he had several broken ribs, a broken arm, a broken wrist, some bones broken in the neck vertebrae, he had bruised every major organ in his body (heart, lungs, kidneys, liver), and suffered massive internal bleeding. His body temp was down to 90 when they found him and his blood pressure was down to 60 something. Doctors ended up removing his spleen which had been torn into three pieces. He showed me the picture of it and it looked like it had been shot. He's lucky to be alive.

As Carpmaster said, be careful out there and remember to take that cell phone if you have one, and let someone know where you're hunting!