That decapitated head Val posted above keeps reminding me of a scene in a movie I once saw but I can't recall the name of it. Instead of using my working hours on searching (I've already used up at löeast 30 minutes without success!) I figured I should just give up and ask you geeks.
There's some sort of horror/thriller where a group of people are camping or something in an area that has been used for military training or was it something with mental patients.... See, I really don't remember the details... All I remember is that there were soliders/patients still around and they were picking off the group of campers one by one. I don't think all of them were even friends/campers because I seem to remember the only survivors were a couple of prostitutes that escaped in a boat? Gosh, my memories are as messy as my dreams...
The one thing I do remember is that two of the characters discussed how long the brain is alive after decapitation (or a deadly injury to the body) and Damian Lewis's character claimed it was alive for a few minutes or so... And then he got decapitated and you saw his face light up as he realised he'd been right. And then he realised he was pretty much dead...
Been trying to find it by seaching for Damian Lewis films but I can't find it. I'm like 98% certain it was him, though...