As some others have said, sometimes they are
very hard to kill. I have a nice scar on the outside of my right leg from one. I used to trap way back when I was in high school. A possum pelt would only bring about a buck or so so we never really kept them since they weren't hardly worth skinning. Generally we'd just scare them into 'playing possum', and then hold their head down with our boot and let them loose from the trap and let them go. Yeah, some were stupid enough to be back in the trap after we re-set it and were moving on.
One time this huge possum was just really ticked off about being in the trap and flat wouldn't play possum. It just wanted to attack us when we got close. I had a Ruger 10/22 and ended up unloading the entire mag in it's head. Man, what a bloody mess! Figuring that we may as well skin it, I grabbed it by the tail and started walking off to check other traps. Yeah, you guessed, it wasn't quite dead. That blasted thing popped it's eyes open and lit into my leg as I was carrying it. Maybe it was fear or instinct, but I tore up a good 10/22 beating that thing off of me and making sure it was dead. I didn't have anymore ammo, so I sort of used the rifle as a bat.
You should have seen the people in the emergency room when I walked in, all covered in blood, my pant leg ripped to pieces and carrying this bloody mess of an animal!

I didn't want any rabies shots if I didn't have to have them, so I brought the thing with me to the hospital. Fortunately it didn't have rabies. It was just really pissed off. I think I got a half a dozen stitches out of the ordeal.
At that time the very first "Friday The 13th" movie had just started playing at the theaters. We called that possum "Jason" after the guy who wouldn't die in those movies. A funny thing though, it seems like you just show a possum a car tire and they're dead! I don't get it. You can empty a mag into one, beat it for 15 minutes and they will still get up and walk away but one clip by a car tire and they're instant road kill. Go figure. I shoulda carried a car tire with me that day trapping!
