Douglas Knight:
It’s more amusing if you get the outside input from other people. (but it’s biased)
Not at all—just internally number the choices, and ask a friend to choose 1, 2, or 3. Then, again, react to the result emotionally and act on your reaction. My girlfriend and I do this all the time.
I’m almost seeing shades of Self-PA here, except it’s Self-PA that co-operates.
If I assume that the other agent is perfectly rational, and if I further assume that whatever I ultimately choose to do will be perfectly rational (hence Self-PA), then I know that my choice will match that of the paperclip maximizer. Thus, I am now choosing between (D,D) and (C,C), and I of course choose to co-operate.