OK, I have a story. My MC2000 weighs 135 lb. and I had it stacked vertically above 2 monoblocks also stacked. The MC2000 was on the top shelf sitting on a BDR Shelf for the Source (about 35 lb. I think) sitting on racing cones.
I was moving to a new house and a friend came over to spend an evening listening and to help tear down the system. We stayed up late enjoying the music and retired. Early the next morning, we started with the amps. We stood on both sides of the amp and lifted it. The plan was to lift, step sideways 2 steps and lower the amp to the floor.
We lifted, but what neither of us realized was that the shelf had adhered to the feet of the amp and lifted also. We took the 2 sideways steps and at that point the shelf separated from the amplifier feet and fell to the floor one edge first, landing on top of the bare foot of my helper. There was a fair amount of blood, and a quick trip to emergency was required. Luckily no broken bones.
The weight of the amp had disguised the fact that the shelf stuck.
This happened 22 years ago, and my friend still reminds me that through it all, he didn't lose grip on the amplifier. I am eternally grateful for that.
Bill