1. The 'famous violinist' thought experiment:
You wake up in the morning and find yourself back to back in a hospital
bed with an unconscious famous violinist.
He has a fatal kidney ailment, and you alone have the right blood type
to help. You have been kidnapped, and the violinist's circulatory system
has been plugged into yours, so that your kidneys can be used to extract
poisons from his blood as well as your own.
To unplug you would be to kill him. He needs to be attached to you for
only nine months. By then he will have recovered from his ailment, and
can safely be unplugged from you.
What do you do?