Hall & Oates video

I saw a Hall & Oates video where the bass player was standing next to a stack of MM equipment. They were in the background and eveyone was jumping around so I couldn't tell what they were. The stack was up to his shoulder level so I'm guessing a couple of 410's of some variety. My heart jumped when the bass player bumped into the stack and it started wobbling. I suppose the video producers assumed no one would be watching the bass player so they left it in.

I just went to YouTube, and watched that video (You Make My Dreams Come True). I wonder what stopped that amp from falling over?