Possibly slightly off topic but connected so to speak....
I was flying home to the UK from Orlando and was a few pounds overweight on the hold baggage, for a few pounds read 5lb. The airline (Monarch) wanted to charge me a stupid fee of around 100$ stating that it was calculated on 1% per pound of the first class fare. I thought that was a rather clever trick given that Monarch was an all economy seat charter airline that doesn't have any first class seats.
I agreed to pay but told them that they would have to bill me at home as I didn't have any money left after having spent it all in America. They said they could accept a credit card but I didn't have one in those days. (True)
You'll have to bill me.
Then they said they would accept travelers cheques but I didn't have any (True).
You'll have to bill me.
Then they said they would accept a debit card but I didn't have one. (Actually, not strictly true but it would have put me overdrawn, but they didn't know that).
You'll have to bill me.
All this arguing took 30 minutes to check in two people so the clerk asked us to move aside which I refused to do on the grounds that we had not checked in fully. Clerk went to find a manager. Manager arrived, said that 5 lbs was just over two kilograms and really wasn't worth arguing about, handed me our boarding cards and wished us a pleasant flight.
Sometimes, if you dig your heels in you win. I heard later that the clerk was wrong anyway. She had read 5lbs but calculated it as 5 kg. We never did get billed either.