Using a commercial off-the-shelf brain-computer interface, researchers have shown that it's possible to hack your brain, forcing you to reveal information that you'd rather keep secret.
For $200-300, you can buy an Emotiv (pictured above) or Neurosky BCI, go through a short training process, and begin mind controlling your computer.
Both of these commercial BCIs have an API — an interface that allows developers to use the BCI’s output in their own programs. In this case, the security researchers — from the Universities of Oxford and Geneva, and the University of California, Berkeley — created a custom program that was specially designed with the sole purpose of finding out sensitive data, such as the location of your home, your debit card PIN, which bank you use, and your date of birth. The researchers tried out their program on 28 participants (who were cooperative and didn’t know that they were being brain-hacked), and in general the experiments had a 10 to 40% chance of success of obtaining useful information (pictured above).