Its extremely improbable, and effectively impossible to recover lost coins. This is what the security of Bitcoin is actually based on. If youve lost your private key, the system is so secure that you may not be able to recover it. But, if you were pretty sure that your passphrase contained words from a sentence from The Return of the King, but youve forgotten which page, then there's a solution. There are also tutorials for recovering your bitcoins in the aftermath of a technical difficulty, like if the hard drive you had them on broke down. But unfortunately for people who totally forgot their passwords, tutorials like this one require you to actually be able to locate the drive where the bitcoins are stored. Not to mention, success stories are rare and exuberantly celebrated.