Taxi rank maths: if 14 people fit, why did 19 just get in?

Was at Bree yesterday. Driver goes "there's space at the back" like it's a suggestion and not a physics exam. I'm already sharing a seat with a guy holding a live chicken in a Spar bag. Cool. Respect the hustle. Then two aunties squeeze in and one of them goes "don't worry, we're family" — we are NOT family. I don't even know her name. Anyway. What's the most creative "there's space" moment you've survived?