They are amazing when you see and hear them in the wild. I only saw them a few times, mostly from a distance, except for this once when we were driving down the road (in an open-air vehicle) at night and I looked over my shoulder and saw this walking up behind us:
I only avoided screaming like a little girl by clamping my hands over my mouth, so what came out was this little squeaky muffled voice saying "hyena." It was just strolling along the edge of the road, then turned and vanished off into the dark. A few minutes later we heard them calling and howling all around us, and then the lions started roaring back at them. It was amazing.