Interior Room Destruction

I was watching Blender Guru's (@andrewpprice) tutorial about Interiors in Blender (https://youtu.be/wrzSrjAY69c) but I guess I clicked on something wrong and I got this result. Thanks a lot for a ruined room Andrew :(

Blender (Layout, Modeling, Render) + Houdini (RBD and Vellum Sims) + Fusion + Octane