Analogy time:
You use a wooden chair for reaching up in high places. Imagine you're a short person and utterly dependent on this chair. It works for 20 year, and it helps you reach what you need in all that time. You never notice much except for some familiar creaking. The chair works every time, and you just take it for granted as a handy tool to have around.
But when the wood in that chair snaps, it happens all at once. Even if just a single part of that chair momentarily fails. Gravity, leverage, falling backwards with no way to protect your head. And it happens so fast, there's no time to think about it while it happens.
Luckily your husband put a cushion on the floor exactly where you'd fall with your neck, because he anticipated this happening. He just didn't know when it'll happen.
You wake up a bit dazed, and a bit wiser to how the world works. How fragile and complex systems can fail all at once and too fast.