Hi, I am working on a video, and I was wondering if any of you knew of some real-life demonstrations I can do about black holes? So far I have the gravity well, and the balloon covered by foil that you crush to show same mass but denser. My video is about the anatomy of a black hole, so I cover all the parts from photon spheres to singularities. Do any of you know of some interesting and or funny demonstrations I can do in real life? Limited visual effects because I want less animation and more me actually doing stuff.