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Myself in 30 years... just so I can laugh at my inevitable baldness. And because the older me will at that point remember meeting me previously, it'll be a joyous reunion and we will go out for steaks. That is, if cows are still around then. After catching up on lost time, the younger me will go back to the present day and try to make people believe that I had just had a lovely steak dinner with the bald me 30 years into the future. Of course they won't... because it's a pretty silly idea.