I've attended a couple ayahuasca ceremonies in the US. The first was very a peaceful affair. The second was not. There was yelling, screaming, the energy was all over the place. At moments, it felt very chaotic, like the top was going to blow off the whole thing. The facilitators (shamans) did an amazing job of holding things together, but that doesn't mean that I didn't experience some very intense waves of paranoia while all of this was going on. We were in a somewhat secluded place, but maybe not secluded enough to have made the screams inaudible to our closest neighbor. It was a rough evening for everyone.