Is there anyway I can recover my passphrase? I have a wallet for the bitcoin qt wallet but I accidentally deleted the only copy of my encryption passphrase... I have read about something called brute force but I'm not entirely sure on how its code is used. Can anyone help me please!? I am desperate to recover my bc!
It's rather implausible unless you remember a good deal of the password already, or you are certain that it followed a particular pattern. Even on a good processor you might only be able to try 10 variations a second, which is uselessly slow for anything in the password cracking world. 

It needs to be strong, the encryption is designed keep your coins safe. 

How much is at stake? Recovering them might not even be worth the time expenditure.