It doesn't do to get on the wrong side of Martin Johnson.
During his years as one of the most respected players in world rugby union, his towering frame and ferocious frown were enough to strike fear into opponents, team-mates who stepped out of line, and hapless journalists.
The full force of the famous eyebrows can wither at 20 paces.
The man who won a stack of silverware for Leicester Tigers and the beautiful golden William Webb Ellis trophy for England was a formidable captain and, after two and a half years in the job, is establishing himself as a successful national manager.
But I have to confess I was feeling a little nervous as I sat down with him to reflect on his coaching career so far, at the start of a momentous year.