The fastest way would be to buy them (at Bitstamp, BTC-e, Localbitcoins or any local exchange).
The easiest way would be to use faucets. Almost all of them have a minimum payout ranging from 0.055 to 1 mBTC (0.000055 - 0.001 BTC). It would still take around a week to get the bitcoins, though. To find faucets you can use this faucet rotator.
You can also try to sell signature space or services.

If you have a decent/good graphics card (AMD is strongly preferred) you could also try mining. If so, just download GUIMiner scrypt and then I would suggest mining at Middlecoin, where you mine different alt coins that are then automatically converted to Bitcoin. This method would probably take a week or two, depending on your gear and how much time you spend mining per day.