If there are any inaccuracies, tell the person who told it to me. Maybe someone else would know who it happened with.
A (not sure which) Bobover Rebbe, when leaving the hospital was in terrible pain to the point where each breath was a big effort. Once he left, he needed something put together (maybe something he could stay in while he was being transported to his home). A Chassid was trying to put it together but for whatever reason, it was taking much longer than expected. The weather was very hot and humid, and the Chassid was working without letup. After a bit, the Rebbe started rubbing his hands together. The gabbai saw and he thought the Rebbe wanted to wash his hands. He went into the hospital and brought water. The Rebbe shook his head, and continued repeating the motion. Finally someone realized the Rebbe wanted a towel, so he went into the building and brought out a paper towel. The Rebbe, barely able to move at all, leaned over and wiped the sweat off the Chassids forehead.