I always say "rider on your ?????" that way the person has an idea of the size of the person passing them. and I had to put ??? coz lately it seems walkers have been walking on the left side of the path so I have to pass them on the right. If I'm riding with someone I always say riders of your ??? so they know there's more than 1 of us coming.
But I"m with ya CC - I had some guy blow past me the other day without saying a word, scared the bejesus outta me. Lately I've started chewing em out saying "next time say something please".
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"