Not from a car ... we should all know from experience that a cyclist can't hear a thing that someone yells from a car! 
Not much from a bici, either. There's no time to have a meaningful conversation. I might yell "right side please" in the circumstances spokewench describes.
Running in town, there are days it seems like I holler "Bikes on the road" four or five times a mile. Running in south Florida where my in-laws winter, I've been run off the sidewalk, into traffic, by people on bicycles, several times.
So the answer to your thread title is no ... I yell at them to get ON to the road.
I did send my neighbor a whole bunch of bicycle safety links after he told me about how he rides - either on the sidewalk or against traffic.
Speed comes from what you put behind you. - Judi Ketteler