years ago going through LHR SQ slave class with 20 kg of luggage and over 20 kg of books
Packed books into small carryon waltzed up to counter with trolley - checked bags
"Any hand luggage Sir?"
Picked up carry-on ONE HANDED to shoulder height and smiled - "just this"
"Fine"
HH whistles off cheerfully, round large pillar where turned grey, burst into a torrent of sweat and advanced palpitations..................
Since then I've paid the excess.............. partly because hauling a big weight around aircraft and airports is really no fun at all