The following happened to me something like 10 years ago. One day I had to see a doctor I haven't seen in years.
I remembered him as a character having a bit of greasy hair and to be a little overweight, but not fat as such, comfortable but not too slow. Normally I would have expected the waiting room to be full or at least have a couple of people sitting there, but there was no one. And I hadn't to wait more than a few seconds to see him open the door to his room and call my name...
I was surprised to see him completely changed. Elegant, slim, with a lot of vitality compared to the last time I saw him, and I knew him for at least 15 years. So what happened? He told me he lived unhealthy and has completely changed since he had a stroke. And my impression was that he was obviously brain damaged a bit, with the right brain part being offline, or that he had a obsessive loop in his "analytical" brain side. He was very sure about doing the right things and talking about the important matters. He was obsessed with politics and I couldn't get through him to talk with him about the health problem I had. Somehow he had not really something new to tell me I didn't know before, he was very upset about corruption and the crumbling of our civilization, the state. He was a big fan of Prussia, the wise King, which was at least always something he would always bring up somehow and had a educational value. There was nothing I wanted to argue about with him, we had no big different opinions on most important subjects, and I only wanted to come to the conclusion, to say why I came here to see the doc ... but he would never stop talking and inquiring.
Anyway for 30-45 minutes he wouldn't stop to check me on this or that subject, and I couldn't tell him 10-30% of the 3-10 sentences I wanted to tell him. I became angry and started shouting at him, lol. But he wouldn't stop talking about "trivialities", the state of the world etc.
So I never showed up again to take blood samples. Very sad. I saw him a few times when I walked around in the neighborhood but he didn't notice me (most probably), he seemed somehow very satistfied and happy, obviously indulged in his thoughts, fantasies, observations, discoveries, who knows
... "I am so smart, I can see through everything". Or like he would be on some kind of happy making pills or something. lol. That's what he was like. And possibly he was right, but I pittied him of course, and I have a bit of remorse to have been loud with him. It made me very sad to see him go bankrupt and mad like that, I always liked him a bit. I wish I knew a trick for such kind of people, how to lead the discussion in the right way when you have someone who is in a similar situation like e.g. someone who has Alzheimer.
So anyway, the only other two times I found empty waiting rooms to see the doctor was once at a hospital during summer holidays and once when I had a nigger doctor that suddenly appeared as a GP colleague (before him waiting times would be hours).