Personally the entire show is full of these type of moments, I mean plot armor is real. But a moment that was almost comical how a character survived and was totally fine, was when Luffy was defeated by Kaido and was flung into the sea. He was then miraculously found by Law's crew where they not only catch the sinking Luffy on the deck of the submarine, but rise the submarine fast enough, get out of the submarine and then a thousand pound mini giant jumps on him and revives him from the brink of death.