Now not all of us have 9v batteries just lying around (in fact the only place we can think of in most homes that have them is smoke alarms and while you may think that having battery is a life or death situation, we're gonna say having a functional smoke alarm might be a better idea so don't go tampering with it unless it's very important), but if you do this hack courtesy of the Crazy Russian Hacker should get you out of any sticky situations.
Just try not to burn anything down or shock yourself.
Via YouTube