From The Upstarts, by Brad Stone, loc 771-786:
On a separate night in Paris, the group went for drinks on the Champs-Élysées and then to an elegant late-night dinner that included wine and foie gras. At 2: 00 a.m., somewhat intoxicated after a night of revelry, they hailed a cab on the street. Apparently they were speaking too boisterously, because halfway through the ride home, the driver started yelling at them. McCloskey was sitting in the middle of the backseat, and, at five feet ten inches tall, she’d had to prop her high heels on the cushion between the two front seats. The driver cursed at them in French and threatened to kick them out of the car if they didn’t quiet down and if McCloskey didn’t move her feet. She spoke French and translated; Kalanick reacted furiously and suggested they get out of the car. The experience seemed to harden their resolve. “It definitely lit a fire,” McCloskey says. “When you are put in a situation where you feel like there’s an injustice, that pisses Travis off more than anything. He couldn’t get over it. People shouldn’t have to sit in urine-filled cabs after a wonderful night and be yelled at.” That cantankerous Paris taxicab driver may have left an indelible mark on transportation history.
Earlier in the book, Stone offers a clear account of how the original concept for Uber was grounded in the experience of being a young multi-millionaire in San Francisco, frustrated by the constraints of the city’s taxi industry.