Many years ago my mother put that question to a Spanish butcher, hoping to get some fresh eggs for a tortilla or something. I understand she got a bland facial expression from the chappie behind the counter. It happened to me just now, when I drove to a petrol station in search of ingredients for a Kaiserschmarrn. My version was: Haben Sie Eier?. He'd apparently heard that question before and simply pointed to the refrigerator.