Create a 10 word diceware passphrase, using the EFF's list. Try to memorize it, it shouldn't take long. Hash it with whatever hash you like. Even MD5. Try to crack it with Haschat. Spend as much time and/or money as you like on the project. It's got over 128 bits of entropy, you won't succeed before the Sun becomes a red giant and incinerates the Earth.