Dogs (especially large ones) jumping on trampolines can cause seismic tremors and possibly even a small earthquake if allowed to go on for over 15 minutes.
The danger comes from what is called “resonance frequency” which in lay terms is simply when you put energy into a substance or object at its resonance frequency, you force it to vibrate or resonate (forced vibration). It’s the same force at work as when marching soldiers break their cadence when crossing a suspension bridge. Source: Fool Moon
Courage to me is doing something daring, no matter how afraid, insecure, intimidated, alone, unworthy, incapable, ridiculed or whatever other paralyzing emotion you might feel. Courage is taking action…..no matter what. So you’re afraid? Be afraid. Be scared silly to the point you’re trembling and nauseous, but do it anyway! ~Richelle E. Goodrich