Yes, it has happened - never on any major scale that I have noticed, but a very few times in the years I've seen him he's reacted with mild frustration. For me it has been very helpful to realise that somebody can be frustrated with me and still not reject me utterly. I can be a bit annoying but that doesn't necessarily make somebody hate me or want to avoid me. And if T is frustrated with me it's to do with my actions or words, not my person, and the frustration is not going to last. I also trust him not to allow it to impact on his professionalism.