ORIGINAL: silentassassin
I have actually shot a few that didn't run off after the shot. I shot one a couple of years back and hit him irhgt behind the shoulders with a perfect double lung shot. He took a couple of steps and then looked back to see what "stung" him and I could see where I had hit him so I just hung my bow up. The deer stood there for a minute or so looking and then turned to walk off. As he turned to walk off I could see that he was bleeding a stream the literally looked like someone running a water hose. That deer walked about 10 yards and laid down. He layed there with his head up for about 10 minutes before expiring and that was one of if not the best shots that I have ever made on a deer.
Also, in hunting camp last week I saw pictures of a deer that had been killed that had been shot the day before in the shoulder and the arrow just hit the shoulder blade or bone and turned and went down his leg. Well the next day the guys buddy shot the deer while he was chasing does. He made a double lung shot (which I saw pictures of and talked to the landowners son who confirmed this when gutting). The guys watied 30 mintues or so and started tracking and jumped the deer and the deer wound up making it several hundred yards and living for another hour or so where the landowners son and the 2 guys found him dead. Now I wasn't there, I only say the pics but the landowners son is a pretty quiet and straight up guy and I have never had any reason to question anything that he has told me but I have to admit that I was a little skeptical until 2 days later when my deer pulled a similar feat after taking and arrow through both lungs.
PS - I have seen deer go a long long long long..........ways on a one lung shot and I tend to believe that some of them survive them as well.
SilentAssasin - you got me!

I should of rephrasedmy statement and added "personally" in there. I too have witnessed this strange happening, not in front of me, but on a video kill that a good friend had a few years ago. Same exact circumstance, the buck just walked around for almost 7 minutes of video before laying down like dog in it's bed to expire.......pumping blood out of it's lungs the entire time. My buddies and I talked about this occurance for quite some time, and came up with a couple "parallels" in the stories: it has only happened with bucks,(age, size didn't matter) and it has only happened near rut time, when the bucks are in a different state of mind.
Your back of the lungs shot last week, I believe is a common occurance to a lot of guys. The deer gets jumped, and is lost. For a lung shot deer to expire, the lungs literally have to fill up with blood, and with a higher, further back hit, that takes a lot longer. I too believe that a single lung shot deer will live, especially with a higher hit,towards the top of the lung. But for example, if you shoot straight down at a deer, and poke a hole right through the center of one lung, that deer is dead, and you'll find if you try hard enough.