Teacher agreed and proceeded with the law course.
When the course was finished and teacher started pestering the student to
pay up the fee, student reminded the deal and pushed days. Fed up with
this, the teacher decided to sue the student in the court of law and both
of them decided to argue for themselves.

The teacher put forward his argument saying:
"If I win this case, as per the court of law, student has to pay me. And
if I lose the case, student will still Pay me because
he would have won his first case.
So either way I will have to get the money".

Equally brilliant student argued back saying:
"If I win the case, as per the court of law, I don't have to pay anything
to the teacher.
And if I lose the case, I don't have to pay him because
I haven't won my first case yet. So either way,
I am not going to pay the teacher anything".

This is one of the greatest paradoxes ever recorded in history.