Well many years back a Shaman friend of mine told me to put bells in my car, and on the door of my house. Said bad spirits really hate the sound and they don't stick around. Then there's the spirit bell on bikes... similar sort of thing. What do I think? I think they are cool. I mean if a friend gives you one, if nothing else it means they're wishing you safe and happy riding. And just the act of giving is a nice thing to do. You can't lose with a spirit bell so what the heck. They generate good thoughts. I have one to keep me company.