My old man rented cars for the drive to and from Heathrow for the family trips abroad. Being from Yorkshire, he always rented the smallest car, hoping for an upgrade when the family and luggage wouldn't fit.
One time Hertz brought round a Mk1 Fiesta, and their was no chance of everything going in. He whinged and kicked up a fuss, and they brought round a 127 as an alternative...
He grumbled away as he tried to load up the cases, and low and behold they all fitted. I guess the Fiat had a deeper boot as the spare was under the bonnet.
He was so impressed, he went out and bought one to replace my Mums 1980 Mini City the following week.