I believe you're right on the date. We were living in Paris at the time and got the benefit of 'display advertising' for both productions.
The humor sounds to be in the same vein as "Le Dîner de Cons".
I find much of the French humor 'off kilter' enough to tickle my funny bone.
I loved the ad for 'French' Preparation H... showing the "see no evil, hear no evil and speak no evil jade monkeys"... but the last was holding his bum instead of his mouth.
We are fond of the comedy theatres in the Marais. A joke I still remember was a comedienne who was pretending to tell her little boy a night-time story.
It went something like this:
“The story of the three bears”
“Once upon a time, there was a little white girl with long blond hair. She lived in a little house with a pretty garden.
Then one day three big black bears came into her garden. First they tore up all the flowers. Then they broke into her house and tore up all of her furniture and broke her little bed and ate up all her food. And then the three big black bears threw the little girl crying out on the street in the dark and kept her house and all of her toys. The End.
Good night little Jean-Marie!”
I laughed.