Mad Max Fury Road. They defeat the tyrant, and get the control of the water valves. Then they open the valves and seemingly keep them open. One problem, how long is the water reservoir gonna last now?
Logan’s Run. The city dwellers are freed from the computer’s iron-fisted rule, and Carrousel. But their city is in ruins, and thinks to the computer providing everything. They don’t know how to live without it. The city dwellers are going to start dying off real fast.
If we’re counting stones for that particular thread of the timeline, there were countless prior to Commodus’ pile.
True, there was many but commodus I think was the stepping stone to the fall as the shithead essentially almost bankrupted rome and caused civil wars since he was so shitty he did not have a kid.