I know that's not easy and not possible in just one day. I just thought if maybe someone has some good method for investing or something that brought him nice profit. I know it's always a risk, just courious to see what are the experiences.
One good way is investment in lending procedures. Lending your money is the best way to gain profitability from it in my opinion. It's rather safe and the usual percentage you earn is around 20% everytime you lend. That makes rather quickly a lot of money, but no way you more than double your btc in "a short period of time" ^^
What kind of lending do you mean? To other forum members? BTCJam? If someone's willing to pay 20% on short-term loan, he's probably a scammer or gambling degenerate.