Challenging someone's mind is hard but when you can it's beautiful. If given a choice between love forever and infinite wealth the challenge is put simply greed or self worth. When one can add in death to that it can turn sour. Which should a self driving car hit? A grandma or a baby. Things like these make you think out yourself in the wheel of that car and now it's you who will have to pick who to hit.
Challenging isn't it well that's the worst your mind can be challenged. Would you take a bullet for your soulmate where no matter what you die. Would you let the bullet hit your soulmate and watch as the life spills from them.
Things like death challenge the mind because your brain can't comprehend it. Think about the wakes your decisions could make later in life and what that could mean.