You decide to use your time machine to go back in time and learn the lost secrets of demon summoning. Then, you could return to the present, summon the demons, and bend the world’s populace to your will.

But wait. That sounds like an awful lot of work. Do you even know where to find demon summoning information in the past? There must be an easier way. If only you could find a way to skip doing all that work.

Well now, why can’t you? After all, your plan is a guaranteed success. So, why not just go visit yourself in the future, after you’ve already conquered the planet, and ask yourself how you did it. Then, you’ll know how to take over the world, and you won’t have to do any of the research yourself.

• Do you go back in time?
• Do you go forward in time?