Home "Improvement" - Walls Fall Down and Go Boom When Not Attached

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I thought I did some shoddy repairs in my life, but this was just scary. The installer of a wall that I planned on removing had never been attached to the ceiling. It was basically just caulked to the ceiling, which made it look like it was actually attached.

One end of the wall ended halfway through the living room and the other end cornered at the hallway. I tore most of the drywall off and found that the top 2 feet was plaster again, go figure. I thought I'd start at the hall end and start removing bit by bit as I went across the room. So I break out my trusty saws-all, and start cutting at the corner next to the hallway.