I stumbled onto the video below of Muhammad Ali doing candid camera appearances in a classroom full of kids. By the looks of it the kids must have had some sort of task to do with Muhammad Ali and as they are sitting at the desk in front of the class talking about Muhammad Ali, he appears from behind them dressed in his boxing clothes.

The expressions on the kids face when the greatest fighter of all time appears in front of them are priceless. The last one is so fantastic, Muhammad Ali is essentially staring down the little boy, who is unafraid of his commanding presence and domineering body language and continues to talk to Muhammad as if they are sitting in a coffee shop.