A short time ago I was working with an agile coach. He was quite experienced and well known in the agile community. He also held a wide variety of certifications.
We were working together on a project that had, if I were to be honest, quite a few cultural and organizational challenges.
There was one specific individual who always seemed to be the most challenging. My coaching colleague and I were talking about them one day and he was grousing (complaining) about them to me.