It is well known that the royals buy each other joke presents for Christmas , but it would seem the festive season isn't the only time they exchange funny gifts.
The late Princess Diana was the chief prankster of the family, often doing cheeky things or buying naughty gifts for her sons.
Several stories about Diana’s mischievous antics have been made public but one story that rises above all others is when she arranged a very special surprise for her eldest son - and it is safe to say that he won't forget it in a hurry!
