L.P. Hartley wrote "The Past is a foreign country; they do things differently there," and while I could probably navigate my way around reasonably well, it would still be lacking much of what I like about the present (and it'd take me too long to get to the lifestyle I'd like, even with all those World Series and Super Bowl bets).

The future's even more foreign, though. I've seen how tech has changed in 50 years, and can't imagine it would be easy to adjust without a huge amount of culture shock.

So I'd take the $100 mil.