Then there is me.
If I ring the bell on my own bicycle, I can't hear it.
If i'm a pedestrian on a shared path and don't hear a cyclist ring their bell behind me, ...
I get run over. :-(
Maybe I should wear a sign on my back.
Hey, you are half way through uni !!!!!
GHOSLO makes a good point. My experience is that I can't win when I'm biking on a multi-use trail. If I use a bell, half the people are visibly annoyed. If I don't use a bell, the other half are annoyed. My compromise is that I usually call out a friendly, "Good morning! I'll just pass by on your left." Then as I pass, I say, "Beautiful day!" or "Nice dog!" or something similar that's hard to argue with. It often works although some people move to the left when you say you're going to pass on their left. Natural selection is not finished.