The Pope and the Queen of England are on the same stage at an Anglican and Catholic commemoration of the Anglo-Irish accords - the crowd is huge - thousands. Her Majesty and His Holiness can't help but have a little rivalry - both being heads of churches and all.

The Queen says to the Pope, "Did you know that with just one little wave of my hand I can make every English person in the crowd go wild?" He doubts it, so she shows him. Sure enough, the royal-gloved wave elicits rapture and cheering from every Englishman in the crowd.

Gradually, the cheering subsides. The Pope, not wanting to be outdone by someone wearing a worse frock and hat than he, considers what he could do. So the Pope says to the Queen,
"Your Majesty, that was impressive. But did you know that with one little wave of MY hand I can make every Irish person in the crowd go crazy with joy? Their joy will not be a momentary display like that of your subjects, but will go deep into their hearts, and they will speak forever of this day and rejoice - they will recount it to their grandchildren and they to their descendants.

The Queen seriously doubts this, and says so.
"One little wave of your hand and all Irish people will rejoice forever? Show me."
So the Pope slapped her.