I accidentally activated this in the grocery store like 2 weeks ago and had no idea how I'd done it until just now seeing this thread. My phone started beeping loudly and counting down on the screen and it freaked me the hell out because I had no idea what was going on. People were looking at me like I was about to detonate a bomb or something! As soon as it finished and starred to dial 911 automatically I hung it up before a ring, but goddamn it was concerning to me and those around me. What the hell, Android?