I had a very bad experience with my one and only illegal open house. Never again.
My 2 friends and I went there. One drove us there. We really didn't know anyone there, and turns out one person was a confidential informant. Long story short, my friends and I somehow thought it was a good idea to drop acid in a neighborhood we didn't know, with people we didn't know. Within 10 minutes of it starting to hit me, my friends and I were standing near the door. Kids were kicking in walls and taking pcp and stuff and we thought we saw flashing lights outside. It took us a few seconds to realize they were real and we just stared at each other. The police come banging on the door and my friends and I dip out the back door, telling everyone in the yard. We still had acid so we didn't want to get caught with it and didn't want to just throw it on the ground so we kicked down the back fence and ran a good mile through a forest preserve/wetlands type terrain, all the while tripping balls in almost pitch dark (it being a little past midnight). We hit a bike path and followed it, then it brought us into a main street and we called 2 of our other friends to come pick us up.
The next morning we went to retrieve my one friend's car he left outside the house and luckily it was still there/not impounded. Pretty lucky all in all, but hey it wasn't that bad of a trip.