Rav Yisrael Lipkin of Salant
The door of the synagogue opened suddenly, and a man rushed in to hear Kedushah. In his haste, he stepped on the shoes of one of the mispalelim and soiled it.
After Kedushah, R’ Yisrael called the man over to a corner and told him to apologize to the person on whose shoe he as stepped. “True, hearing Kedushah is a great and precious mitzvah,” said R’ Yisrael. “But the mitzvah gets ruined if it by doing it one harms another person.”
From “Sparks of Mussar” by R Chaim Ephraim Zaitchik