I had an incident of somebody with ill intentions following my wife an I one evening about a decade ago.
We were headed home after shopping one evening and there was an area we drove through that was kind of sketchy. As we went past a parking lot I saw a vehicle parked with its headlights on pull out behind us. At the next stoplight I was turning left and they pulled up close to my Suburban and then shut off their headlights.
When the light changed I drove on and noticed they turned their headlights back on and were still behind me. I got to the next light, and they did the same thing. They pulled so close I thought for sure they were going to bump my truck. They again, they killed their headlights. When the light changed, I started making random turns as my wife asked me what I was doing. I told her I had a bad feeling about this vehicle behind us. They stayed with me at each turn. After the 4th time, I had my EDC at the time, a Springfield XD45 Compact out and in my hand. I knew there was a nearby park that had a baseball diamond and was lit up most nights.
I told my wife to hang on, punched it to get some distance between us. When I got to the park I raced across the lot, and turned around back facing the entrance to the lot. I parked directly under a light in the lot, got out of my truck while staying behind the door, and waited.
About 10 seconds later, they pulled slowly into the parking lot and stopped. After sitting there for a minute, they backed out of the lot just as slowly, and took off the way they had come from.
My wife and I waited for about 10 - 15 minutes before we left, watching behind us the rest of the way home, which was thankfully uneventful.