Just for illustration purposes, if you take

1BBBvd9G5YThYVVMSGSxJzQvQiQm3WxJC2

as a passphrase and create a brainwallet from it, you will get

1EFBsAdysTf81k72v9Zqsj3NMuo6KoWD2r as an address, and

5Jn1okR6g8jM3fCjZbCgJQNwwHde8v8Rw2HEpumamnGwFW6ogo1

as the corresponding private key.

If you check this address on the blockchain, you will find a wallet that had 51 transactions with a total balance of once 37 BTC.