So, I know, I promised ten, but I've been so encouraged by some of the responses that I had to include one of my own.
You're hanging out in a field in the middle of nowhere, you know, getting some alone time. Suddenly a man comes out of the woods into the clearing you're standing in. With him is a horse and another man, bound and gagged. He walks up to you and hands you a weapon. He tells you: "You must either shoot this man (whom you've never met nor seen) or shoot this horse (same). Whichever of the two you spare I will set free and release. If you refuse I will kill all three of you.
1) he's telling the truth, he'll release the survivor.
2) you can't kill the man making the offer.
What do you do, and why?