I'm glad I'm not the only greedy bastard here! :p Even just a grand spent when it was $1.375(all-time low) would turn into over half a million if sold at it's all-time high.
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I wouldn't want to change important parts of history unless I had one of Farnsworth's "what if..." machines. Soooo... yeah, I'd send my past self the winning numbers of some lottery with a really smurfing huge jackpot.
Make several copies of Theodore Roosevelt, and freeze them until such a time as they are needed.
Teddy Roosevelt is always needed.
I would cause the writers of FF7 to rename Cloud "Whiny Bitch".