Hallel on Parshas Beshalach
Rav Yitzchok Isaac of Kaliv was once in Lizhensk for Parshas Beshalach. The Rebbe Elimelech asked the Kaliver to be absent when he said Torah at the tisch, for a secret reason that he would not divulge. But the Kaliver did not want to miss the chance to hear the Rebbe's chassidic discourse, and he stayed.
As soon as the Noam Elimelech began to say Torah, the Kaliver jumped up from the table and ran back and forth through the whole house, singing Hallel at the top of his voice. Everyone present was very surprised at such unusual behavior.
Afterward the Kaliver explained himself. "When the Rebbe spoke about the weekly parsha, I was filled with such excitement, and it set me so aflame with hislahavus (fiery enthusiasm), that I imagined myself to be in the midst of offering the Korban Pesach. And so I sang Hallel."