Explaining on Instagram: "Coca-Cola once designed a special “pair bottle” aimed at college campuses to address a modern social problem. As students spent less time meeting new people face to face, the company experimented with a bottle that physically required cooperation. The idea was simple but deliberate, you could not open it alone. Each bottle came with a cap that only twisted open when it locked together with a second bottle. To take a sip, you had to find someone else with the same drink