I have had them a few times. One time I remember was when it was 4AM and I was hitting a gravity bong I knew I was really stoned already because my hands were shaking and I couldn't light the bowl or work it right at all. I managed about 3 more hits and I sat down and all of a sudden I hear a really loud shout that sounded like my mom's voice I looked over and it was nothing. Another one I remember was when I was making nutella sandwiches I started hearing angry shouts calling my name and I got really scared until I realized it was me.