Legend tells that after the Holocaust, R. Yosef Kahaneman zt'l , the Ponevezhe Rov (others say rabbi Eliezer silver TAZ"L) began looking for Jewish children who had survived the war. It was known that some of the children had ended up in churches and were being raised as Christians. The Rov encountered one church that denied the existence and presence of Jewish children within their midst... He was granted permission to enter the children's quarters to inspect for himself -- when he entered he began calling out "Shema Yisroel" and instinctively many of the children raised their hands to cover their eyes and started calling out "mama! mama!"