go back in a time machine and buy shares in Google!!! only slight problem is you may need to rent a time machine ;)
i once did a shares challenge in college where you invested an imaginary £100,000 in real world firms (FTSE100) and finished on about 115,000. so not to great of a return and i won the competition!
all you need is some inside information, that and a way to avoid the authorities ;) .
