Absent minded professor

This really happened.
Absent mindedness of professors has become proverbial. Once I forgot my name for a few minutes and I have now forgotten why and how I forgot my name. That is a different issue. I am now going to narrate an incident that really happened some twenty eighty years back in our department, when I was in service. So you can't call me an absent minded professor.
It was time for admissions to engineering courses in Anna University. So many unsolicited visitors used to come and see the working staff in the University in connection with the admission of their wards. The staff had a tense time.
My Director and Senior professor of our centre was very busy as usual with his work. Even otherwise, that is what professors are supposed to be. I tapped the door and when he said "yes", I went in with a file and we started discussing about the project on hand. It was a long drawn out discussion. But all the while, I have been observing one elderly gentleman frequently opening the door, slightly peeping in, then withdrawing his face and closing the door, probably to draw our attention. This was happening for more than half an hour. Our director also has been watching it with the corner of his one eye like many of the unwilling bosses and ignored it, trying to impress upon the visitor how busy he was. After our discussions, when I was about to move out, my director asked the gentleman to come in. No sooner did the person enter, than the director reacted with an unbelievably pleasant shock unusual of him " oh! Uncle, were it you waiting? You could have barged in as soon as you came. Why were you waiting outside all the time? I never knew you were the person waiting. I thought it was one of those unsolicited visitors who come and disturb us during admission time. I am so sorry, I have kept you waiting. Sorry. Sorry. Sorry. Please come in and take the seat" and went on issuing apologies after apologies for having made him wait for so long. The uncle was wriggling uneasily and uncomfortably but again when insisted, took the seat wanting to say something, but was not allowed by the guilty conscious director who was on an apology mode, not willing to listen to what his uncle wanted to say. When he got a break of a few seconds, the uncle said with a lot of discomfiture that he had come there in connection with the admission of his son. The Director was taken by surprise and asked his uncle " I never knew that you had a grown up son of this age to study engineering. You never told me". Again the uncle squirmed and said " sorry. I AM NOT YOUR UNCLE". Just imagine the way the face of the director went. It was unbelievable and then he told his "uncle" with a wild shock of disappointment and disbelief " really? then are you not my uncle? You mean you are not my uncle! If so......?"
I was all the while in the room as a witness to all that transpired there, but the worst part of it was I was not able to laugh out, but had to restrain myself with all my might. The director cut a very sorry figure and as an afterthought to extricate out of the predicament in which he has placed himself, he turned towards me who was still there in his room much to his embarrassment and said that it was a very long time since he saw his uncle and that since that gentleman looked almost like his uncle, he had mistaken him for his uncle. This I thought was the limit of forgetfulness. I could control myself no longer and so I excused myself and left the room urgently not to create any more embarrassment and to relieve myself of the tension of controlling my laughter for so long and probably for the next one week I laughed and laughed and laughed until my sides split and my stomach developed cramps. Even today when I think of the incident, I could not but burst into peals of laughter. I understood later that the so mistaken uncle was one of those unsolicited visitors who had come to request the director regarding admission for his son.