During the Boston show during Wings 1976 tour..Jimmy McCulloch didn't want to come back on for the encore because the sound p*ssed him off or something and one of the roadies went and told Paul that Jimmy wasn't coming back on and so Paul went into the dressing room and from there it was a cussing and yelling match that ended with Paul giving Jimmy a nice little whack and basically saying "Either you go out there or leave the band" and Jimmy went on out and played.