Havent you asked yourself the same question??
Illegal drugs seems to be the best way and the easist to get rich fast!! Its regarded as the more profitable commodities in the world. Problem might be that you always need to upgrade the arsenal of weapons, bribe, transport whatever.. You divide the income on how many hours you spent working on selling all that stuff chances are that you would be better of with a job on mc donalds..
Watch the authour of Freakonomics talking on TED:
http://www.youtube.com/watch?v=5UGC2nLnaes
The book of Freakonomics have sold more than 4 million, now the movie will be released in start of october.
The movie got rating of 6.5 on IMDB
http://www.imdb.com/title/tt1152822/
[FRKON]