I have two things:
When I was 12, my parents went inside the Home Depot to buy some paint. I stayed in our minivan and sat in the driver's seat so no one would question why an empty van had its engine running (it was hot, needed A/C). I noticed a guy sitting in the back of an SUV a few feet away. The tailgate was opened and he was just sitting underneath it out of the sun. He just kept staring at me. I just tried to avoid eye contact like I always do when people stare at me. I saw him stand up and walk over to an Italian-looking cart attendant and talk to him. The attendant looked at me, said something to the guy, and walked away. The guy walked back to his SUV and stood next to it continuing to stare at me. I just wanted to ignore him, so I picked up a science experiment book that I found lying on the floor and managed to get interested. A few minutes later, I was jolted out of my close-minded reading by a knock at the window. The guy was towering above me. I just barely cracked the window (pinky finger would be lucky to fit in the crack) and asked what he wanted, trying to sound as pissed off as I could because my knees were knocking together underneath the steering column. He kept calling me a "little boy" and saying that he was going to go inside and find my parents. I pretty much told him to screw off and leave me alone, but also said they were coming back and that I was fine myself. He walked off and I called my dad telling him about the weird guy. I also noticed that cart attendant up at the front of the lot looking in my direction. My parents came out very shortly after that. The guy stood there staring and I made an obvious gesture in his direction to my dad. He snapped out of his stupor, got in his SUV, and drove away.
A couple years ago, my mom needed to get something from her dentist office. She went in and I stayed in the van. A small truck (a small '90s Japanese truck, like a Mazda B-Series, Isuzu, or Nissan Frontier) parked next to my window. Two teenage kids were in it and were just laughing and talking in there. They pulled out some sort of cigarettes, but I couldn't tell if they were nicotine or weed or whatever. I was interested though so I kept watching. The guy in the passenger seat noticed me watching and stared me down with a goofy grin and wide eyes. I quickly looked away but knew he was still staring. His friend in the driver seat rolled down his window and they both continued staring. My mom came out though and we left.