If scientists could make you immortal but could only do it by transferring your consciousness into a single video game for ever, which game would you choose?
I'd say the lack of stimulus is the scarier thing there. The world is a vast thing, and even if you could live long enough to experience everything that exists now... huge amounts of new things to experience would have been created in the mean time.
And that's just our planet. There is a paralyzingly large amount of things to experience in the universe.