My biggest nightmare (and there have been many) with my son, was when he went through the 'lets say exactly what I see' stage. We were sitting in the clinic dentist, which only saw kids up to the age of 10 and disabled young adults. We were in the waiting room and a lady brought her disabled daughter in. I could see my 3 year old son looking at her, I was smiling nervously at the lady and her daughter, trying to occupy my son in a reading book, but he kept looking up at the girl.
I was praying, please let them take us in NOW for our turn. I was talking ten to the dozen at him about anything and everything, trying to distract him, then at last they called us, phew, thank god for that, just as we got up, he looked at me and said 'Mum why has that lady got a wonky mouth' - I could have died ! I apologised to the girl and her Mum, but she said no need, she totally understood.