Yeah, one that I always think of is the see-saw one where a sky diver's parachute failed so he aimed for a see-saw with a girl sitting on one end which resulted in the girl launched shot upwards and then landing safely on top of a building.

Their first test used basically a metal plank on a fulcrum and the forces did more to bend the plank than they did to launch the girl and she didn't get high enough.

Their second attempt used a see-saw that was built using suspension bridge tech to essentially make it instructable, resulting in fatal forces from the launch. At this point, they called it busted.

But I see two unrealistic extremes where reality would exist somewhere in the middle where see-saws are designed to not break easily but not to the point of being indestructible and there might be a sweet spot where the forces are high enough to launch girl several stories up but not high enough that she dies from the forces.

Also, for the bull in a china shop one, I'm guessing that saying resulted from a bull ending up inside a china shop during a running of the bulls event, where stress would be high and there wouldn't be an easy and obvious path out on the other side, plus maybe a shopkeeper suddenly trying to get it out in a panic. I think that would get the expected result, especially after a few shelves have broken and each step makes more broken sounds.