Ok, the stickler in me needs to inform you that the following joke is not a French pun, but I found it appropriate for the third leaf...

The book I found this joke in presented this story as true but I would need a more reliable source to ascertain that. Even if it's not true, I find it funny.

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When Charles De Gaulle decided to retire from public life, the British ambassador and his wife threw a gala dinner party in his honour.

At the dinner table the Ambassador's wife was talking with Madame De Gaulle.

"Your husband has been such a prominent public figure, such a presence on the French and International scene for so many years ! How quiet retirement will seem in comparison.  What are you most looking forward to in these retirement years?"

  "A penis," replied Madame De Gaulle.

A huge hush fell over the table.  Everyone heard her answer...

and no one knew what to say next.

Le Grand Charles leaned over to his wife and said,

"Ma cherie, I believe ze English pronounce zat word, 'appiness!"