calling out on trails
Our local regional park district has signs telling cyclists to call out when passing walkers on the trails. I ring my bell or call out when passing, but it bothers me to see walkers jumping to the right as if hit with an electric shock when I ring the bell. For that reason, when people move out of the way, I say "Thank You!" when I go past.
It does bother me a little to be passed by other cyclists, especially if they pass close to me and are travelling fast. I don't always maintain a disciplined, straight line on country roads and have sometimes realized that a passing cyclist came close to hitting me.