CRAZY is the preferred etiquette....flap your arms, scream ICE CREEEEAAAAAMMMMMM, put your hand out and give us the HALT sign!  Friendly waves are friendly and we love them, but we're never quite sure if we should stop.  Don't have money?  That's okay.  Stop us and then go get it so you don't miss us.  We love it when kids track us down on their bikes or moms follow us in their cars to tell us where hot, smiling kids are. You gotta do what you gotta do when you need ice cream!  Make us laugh and we'll come quicker.