What is legal but not logical?

A student from University Of Adult Jokes had failed his final law papers and was obviously not happy.


He questioned the professor and decided to make a raw deal with him...

Student: Professor, do you consider yourself to know everything about law?

Professor: Absolutely, otherwise I would not be capable of standing in front of you and lecturing you on the subject.

Student:
If you can answer this question, I will agree with you and accept my
final examination marks, if you cannot, you will have to give me an "A".

The professor laughed over it but agreed.

Student: What is legal but not logical, logical but not legal and neither legal nor logical?

The professor thought about it for hours and pondered no answer. He had to finally give up as he really did not know.

He gave the boy an 'A'.

The
following day at lecture, the professor was still struggling with this
unknown mystery and decided to pose the question to his students.

Professor: Class, what is legal but not logical, logical but not legal and neither legal nor logical?

He paused for a second in shock when all students raised their hands with a possible answer.

He pointed out one student and waited...

The student:
Sir, you are 65 years old, married to a 28-year-old woman, this is
legal but not logical. Your wife, is having an affair with a 23-year-old
boy, this is logical but not legal. Your wife's boyfriend has failed
his exam and yet you have given him an 'A', that is neither logical nor
legal.

The professor collapsed.