Me and a group of friends were all out partying and someone decided that because we had walked way too far to get back home by the morning that we would all sleep in an abandoned old estate that they claimed to have camped out in a couple times. We had to force our way through a tiny window (the rest was boarded up). There was about 20 of us there that night, we set up lights, told spooky stories and got drunk, then set up sleeping bags and all eventually passed out. I woke up in a panic, I couldn't breathe, I was gasping for air. It felt like someone had been choking me for about a good few minutes, I was in such a panic, I looked around, not one person was awake. Needless to say I got the fuck out of there and high tailed it home. Still my spookiest moment ever. I told others but they didn't believe me (we were quite young around 16).