People of Reddit, What is the most heart stopping-flatline moment you have witnessed?

my grandfather in law…He asked for me by name before he passed. none of his children or grandchildren…He called me to him, hugged me, told me to watch over my wife and take care of the family. Then he smiled and told everyone “It’s my time,” then he took one last breath and passed. the flatline was so loud but you could hear everyone’s heart shatter at that moment…