James Harrison and the Pittsburgh Steelers did not part on good terms in the middle of the 2017 season, despite their long history together going back 15 years. Reduced, rightly or wrongly, to a backup role who spent most of his time inactive, there were reports of his becoming insubordinate behind the scenes, and he admitted that he asked to be released, a request that was not granted until it naturally arose when the team needed a roster spot.
While things ended badly, whatever fences may or may not have needed mending at the time have since been mended, and a lot of bad blood that may have existed among fans has cooled, on both sides of the argument.