The story is told Rabbi Sh’ar Yashuv Hacohen visited Rabbi Menachem Mendel Schneerson and mentioned a certain custom of his. Rabbi Schneerson asked him why a Litvak such as himself observed what is, in fact, a Chassidic custom, and Rabbi Hacohen responded by mentioning his grandparents’ roots in Breslov.
To which Rabbi Schneerson asked: Breslov? What kind of Chassidus is that? They don’t have a Rebbe!
The end. Get it?