got into a funny trouble at CDG with AirFrance.
Our only piece of luggage for two persons was as heavy as 27 kg. Baggage allowance for one person is 20 kg, so, as I supposed, 27 was less than 2*20=40 and it was okay. And how surprised I was when I heard that every piece of luggage should have not exceed the 20 kg restriction and so I had to pay for overweight!
I managed to reduce weight to 23kg and they let me in, but still I'm in doubt: what if they just tried to cheat me (the pay for extra weight was around 100 euros) and the allowance was joint? What are the regulations on this stuff?