I don't know how common this is, but I've occasionally been approached on the street by regular people whom I do not know (who presumably make the assumption that since I wear a kippah, I'm a rabbi) who then go on to ask me halachic questions. While I try to be helpful, I do employ the CYLR warning. (most of these folks are presumably not Orthodox and I'd rather avoid offending their sensibilities, even if it means the answers they get from a rabbi are not as appropriate as we might expect).
Does anyone have a good/better way to deal with this type of occurrence?