I was going to title this “Stupid is as stupid does” but I have already used that title a couple of times before and I was talking about the same thing then. Nothing has changed. The trails are full of really stupid people. Today I was riding along and twice I came upon people on the trail who stepped out in front of me without even looking to see if anyone was coming. Now that was really stupid! I had to brake almost to a stop to keep from running into them. It was a good thing one of us was paying attention. They sure weren’t. And the way many cyclists ride it could have been disastrous. This was a young couple with a young child. They didn’t have a clue I was behind them and what had just happened. And several other times today similar things happened. It is the same thing going to a grocery store. I see it all the time. People make a sudden move turning right in front of another shopper or they turn around 180 degrees right in front of another shopper. They don’t think to look to see if it is safe to do so. Stupid is as stupid does. Forest had it right!
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Tadpole Rider 
Here is what works for me ( most of the time) I have an incredabel and as I approach I give a single ding and a second as I get closer. It has a piercing sound and I usually get an acknowledgement from pedestrians. For cars I carry an Airsound horn which will get a driver to look at me.
Never forget half the population has an IQ below average.
I do too but sometimes they do these things prior to my doing so.
This type of thing is why I ALWAYS CALL OUT AS I APPROACH PEOPLE AHEAD saying, ” on your left/right.”