Reading the thread about going back in time, it reminded me of something that happened once. I was on a bus, sat at the back, on my own, going home I think. I heard a voice in my head that said, "GO BACK NOW.' I didn't listen to the voice at the time as I didn't think I had a choice (Sorry to be vague but don't want to be outing.). It turned out to be a shit time that dominated my mental health to this day. I now often wonder what would have happened had I listened to that voice. I feel almost guilty that I didn't. 
Have you ever heard a voice warning you? Did you act on it? How did it work out?