I was in the room when my grandfather passed away. I saw him go from living to dead--it was weird. It was a beautiful moment though; my dad and uncle held his hand (he had lost consciousness the day before I believe and we knew his time was coming) and told him it was, "ok. you can go" and then, just like that, he was gone.
He loved watching the birds fly out the window from his room and, immediately after passing, a bird flew up on the window sill.
I'm not religious but, for my dad and uncle, who are, that was a perfect moment for them to have.
It was a bit sad--we always kind of thought he was an asshole. Ended up my grandma was the crazy one and he just had to deal with her all the time. When he was in hospice she couldn't come see him due to an illness and he seemed so much lighter and carefree. He had essentially written his own obituary which I added onto for the eulogy (uncles/dad didn't feel up to it) and there was stuff in there I never knew (he was in the marines??). He didn't talk about things and I wish I could've gotten to know him better but, even if he had had more time; he wouldn't have told me.
It was best he passed before my grandmother or we probably thought he was an asshole till the end.
For those curious--they thought he had some blood pressure issues or something. Turns out he had lung cancer. Didn't even smoke. He basically fainted and hit his head, went into the hospital, and never came home. The hospice normally didn't allow terminal patients but he really liked it there and they said he was, "no trouble" so he got to stay. Was really great of them; they really cared about their patients there.