Bitcoin Mining
If only 1 million it would be less that $100 cuz $100 when it started is now 100 million :/
Well first you can rig your GPU or CPU (Whichever has more power) into encrypting data that chips away at digital "blocks" which contain bitcoins, kinda like mining ores in real life or in an MMO if you will, but it's highly not recommended using your own PC. It's better to get an ASIC rig to do that for you but the issue is that nearly all worldwide ASIC towers/miners are configured to bitcoin only and cost a LOT of money if you want to MAKE a lot of money, so you'll have to manually rewrite it to mine something else, like litecoin or altcoin.
This sounds pretty risky 

For people wanting to start mining i would recommend you mine litecoins since it's much easier and you might actually earn cash. be warned though you will need a high end gpu or multiple to be able to make anything.
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2

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We can start a pool or whatever.
Would be a millionaire.