What was the most interesting fact that you discovered about Nelson Mandela?

I read Nelson Mandela's book Long Walk to Freedom: The Autobiography of Nelson Mandela. For my college course on Managerial Leadership, I have to answer the question what was the most interesting fact that you discovered about Nelson Mandela? The problem is there are many interesting facts that I learned about Nelson Mandela and I don't know which one to choose. What was the most interesting fact that you discovered about Nelson Mandela?