[Serious] Reddit, what is the creepiest/scariest thing that's ever happened to you?

My friend (let's call him Hugh) and I used to look for cool smoke spots when we were in high school. One day Hugh called me and said he found an abandoned building out in the boonies. That night we decided to check it out.
We pulled up in Hugh's truck. The building was still in pretty good condition. Half of the windows were boarded up, the other half were just missing the glass. The front doors were padlocked, but Hugh brought a lock cutter just for the occasion.
Since there were no lights in the area, the inside was completely dark. We both turn on our phone flashlights and pan around the room. Other than a couple tables, the rest of the room was filled with stacks of chairs. And I mean filled, like there was barely any room to move.
So we sit down at the closest table, take a couple chairs off one of the stacks, break out the bong, and pack a bowl. I place my phone in the middle of the table with the flashlight pointed up to give us some light.
Hugh takes a toke. Almost immediately after he blows out the smoke, my flashlight goes off. Since my phone had been low on battery before we got there, I assume the batter died. But here's where it started to get scary. The headlights on Hugh's truck flashed, illuminating the room through one of the windows for a split second. It gave us just enough light to see one of the stacks of chairs in the far corner of the room fall over. Then, in the darkness, we could hear more stacks of chairs falling over, one after another, getting closer and closer. We immediately dip the fuck out of there, leaving both my phone and the bong. I can't explain how fast my heart was racing. The next morning we came back to get my phone and the bong. We both were a little scared about going back in, but we felt better because it was bright outside. 5 stacks of chairs that had fallen over made a path right to the table we had been sitting at. Other than that, everything was exactly as we had left it. My phone was in fact out of battery, but that doesn't explain the headlights or the chairs falling over. Ever since then we decided to take abandoned places off of our smoke spots. Worst sesh ever.

/r/AskReddit Thread