Rapidly clicking the sleep/wake button five times will automatically disable Touch ID and present you with the Emergency SOS slider. You don't need to use the slider but if you do, your device will call emergency services (911) and your emergency contacts will be notified of the call and your location.
If activated the feature would prevent someone from physically compelling you to unlock the device. Even with a court order, it would be impossible to use your fingerprint to unlock the iPhone, a passcode would be required.
[via alt_kia] [via Darren]