Demon Car?

This took place roughly 2 years ago and I was sitting in the back seat of my parents' car. They were parked in the grounds of a mountainy foresty lakey area (can't think of a name for it.) I had a newspaper, so was busy reading it. Next thing, I noticed a movement out the window to the left. The car parked beside ours was violently moving up and down as if something underneath was pushing it in to the air! I was staring at it opened mouthed wondering what was going on. There was no one else around and the car was an ordinary 4-door saloon type car. It couldn't of possibly of been hydraulics could it? Also there was no one in the car! It was so unreal. I looked at the tyres they were literally bouncing off the ground. This was going on for quite some time.

Sure enough, as soon as I got out my phone to record the sight it stopped. It was if I was dreaming, I couldn't take in what had happened. I sat in silence just staring at the car for ages. I finally got out of my parent's car and cautiously examined the car. I looked into the interior and it was bare inside. I viewed the tyres, nothing out of the ordinary. For a minute I thought could there be someone in the boot (horrible thought I know). But even if there was, it couldn't make the car fly up into the air? I was shaking, this was how frightened I felt.

I got back in to the car, hoping I was being pranked on live TV, but no sign of anybody within the car park. I prayed the owners of the car would come back and shed some light on to my traumatising experience. But no one came. Even my parents where were they?! I felt as if I had been sucked into another world just me and that odd car in existence.

I had to get away from that area, so I shakingly ran to find my parents. At first, I didn't want to share what had happened with them, but I couldn't keep it to myself any longer. They laughed at it but no more was said about it. I just wish I knew what was going on.

Thank you all so much for reading. I look forward to seeing your comments.