I'm a delivery driver by trade. Sometimes, when it's slow, my job consists of sitting around waiting for a run to be offered. On this particular day there was no school and so my teenage son and I pulled into a completely vacant parking strip between Andy's Custard and MOD pizza. I chose the farthest spot from the road, along the median curb/island with a fire hydrant in it. I know FOR CERTAIN that I was parked exactly parallel with the hydrant, as my son and I joked about it being odd that it was those colors in a parking lot, basically camouflaged and asking for someone to accidentally hit it. As I waited there I heard the sound of someone's car horn, more specifically the locking mechanism beep, but I didn't look up for it or even really register that I'd heard it in the moment. When my delivery app finally notified me I had a job a good 7-10 minutes later and I drove away from the the place I'd been parked. Before pulling all the way away I checked the mirrors, as one does, and low and behold there was a car parked in the space I'd just pulled out of. No one around it, or in it, or walking away as if they parked as I pulled away. Just an empty vehicle, in the exact physical space I'd been occupying mere seconds before. I immediately realized that the car horn I'd heard before must've been from THAT car. I stopped moving completely, half in the spot directly in front of the car and half in the aisleway. I began feeling queasy as I sat there looking at that little black car, utterly perplexed by it. I asked my son to look behind us. I gave him no other context. Just, "Son, Look behind us and tell me what you see?" Hoping he'd say, "So what, it's a car?" or "Oh, that's a cute little car." Something, anything, that would confirm to me that I'd pulled past the hydrant into the adjacent forward space, but to my trembling dismay he and said, "Hey, No, where did that car come from? We were just in that spot. I spent the last like 5 minutes staring at the hydrant." He was visibly upset as well, and in that I found the ability to shake the weird nauseating feeling I was experiencing and tell him, "No, that's not possible. We MUST be mistaken. There must have been more space behind us than we are realizing. I must've been in both spots with enough room for them to park behind us." knowing full and well that there was couldn't have been any space behind us. He let me talk him down, and we've never spoken of it again. I haven't really told this story to anyone because I'm afraid anyone I tell will think I've lost my mind, but I'm convinced that I someone else merged into my dimension from a parallel one that day, or maybe my son and I shifted into another one ourselves. All I know is that every time I go near that parking lot I have that same weird queasy feeling that I felt that day. I can't rationally explain it, so as silly as it sounds, I just completely avoid it now.