Rabbi Yisrael Salanter once witnessed someone running swiftly into the synagogue to say kedusha with the congregation.  In his haste, the man stepped on someone’s newly polished shoes.  After prayers, Rabbi Salanter told the man that he had a financial responsibility to pay for the shoes to be re-polished.  Rabbi Salanter added, “The entire merit of reciting kedusha is lost if its recital causes someone a loss.”

(From Tenuas HaMussar, cited in Love Your Neighbor by R Zelig Pliskin)