Item #4 - the cell phone call....
Living in a fringe cell phone reception area, and having just used it last week to call 911 (suspicious car) I can easily see the first thing recorded being “hello”...:^)
I was surprised how long the phone took to connect through to the County, and the internal GPS wasn’t accurate enough to put me through to the correct city - I was about 1/4 mile inside the city boundaries.
When you are listening to silence, and something finally happens, “hello” seems reasonable...:^)