So myself and db are close in that I tell him everything, but we're not close in that we meet up a lot or anything like that. Mainly because he lives on another continent.
So earlier today, he mentioned that he was going to teach medical students (he's a doctor - well a professor). I just said 'teach them well'. His response when he came back from his teaching session was that he mentioned ME and my experiences with the healthcare system and that their homework was to speak to their friend and family about positive and negative experiences of doctors!
I know I'm just an unmentioned guinea pig, but it means he was hearing me when I thought nobody was listening! I'm famous!!! I doubt he disclosed that it was his sister he was talking about, but I think it's quite cool of him to have taken on board what I've said to him (misdiagnosed a few times because they wouldn't listen to me).