Rabbi Chaim Yitzchak Poupko was a student of the Chafetz Chaim. The Chafetz Chaim once took him aside and said "If anyone ever asks you how to wrap oneself in a tallis - this is the way to do it." He then showed R' Poupko how he wraps himself. R' Poupko thought it strange that the Chafetz Chaim randomly chose this halacha. Nu nu.
Years later R' Poupko was in Israel and he was with the Chazon Ish who turned to him and said, "You were a student of the Chafetz Chaim. How did he wrap himself in his tallis....?"
A shocked R' Poupko showed him.
זכות הצדיקים יעזור ויגן ויושיע!!
מעשה איש עמ' צ