Here’s a story I posted in the gedolim stories thread.
R’ Moshe was hounded by someone who disagreed with something that R’ Moshe had paskened. The man went out of his way to pursue his cause against R’ Moshe. A few months after the issue subsided, another posek (I think the book said R’ Tuvia Goldstein) came to visit R’ Moshe and he saw that antagonist leaving the house. He asked R’ Moshe if the man had come to apologize, and R’ Moshe indicated that the man had not. It turned out that the man had come to ask R’ Moshe for a letter of recommendation because he was trying to find a job. R’ Moshe had written the letter. R’ Tuvia(?) expressed surprise at the man’s chutzpah, and at R’ Moshe’s acquiescence. R’ Moshe said, “The gemara says, “yeish koneh olamo b’sha’ah achas. Maybe this is to be my sha’ah achas.”
(Story was in a book by Rabbi Frand An Offer You Can’t Refuse.)