$1: top-up someone else's metro card, it will restore their faith in humanity
$10: find a neighbourhood coffee shop, buy a coffee, tip the rest, talk to locals
$100: Kindle/books
$1,000: Choose a trade, buy the tools, master them
$10,000: Travel outside your comfort zone, talk to locals, learn their language, get perspective
$100,000: Invest half, spend the other half on the previous items
$1,000,000+: Don't be a money-driven role model to others, study politics and people, use your financial cushion to do good in your community. Stay interested, stay awesome.