As a young man, Rabbi Yosef Dov Soloveitchik of Brisk (19th century author of "Bais HaLevi") once made an offer to a wagon driver. The rabbi would get a ride to a certain city without payment, in return for helping to drive the wagon. Unfortunately, the young rabbi lacked expertise in this skill and made a number of mistakes. The wagon driver kept screaming at him and finally hit him. Near their destination, they stopped at an inn where someone recognized the young man as a brilliant scholar. On discovering the identity of the person he had insulted and hit, the wagon driver was deeply embarrassed. He ran over to Rabbi Soloveitchik and begged his forgiveness.
To the relief of the wagon driver, Rabbi Yosef Dov Soloveitchik forgivingly smiled and said, "What is there for me to forgive? You did not insult me for my lack of Torah knowledge. You were irritated over my lack of skill in driving the wagon. You are correct. I am an ignoramus in this area, and can understand why you become angry at me."
(D'muyos Hod, vol.2, p.54; Rabbi Pliskin's "Gateway to Happiness," p.306)