Coca-Cola's "2nd Lives" campaign, launched in Vietnam in 2014, offered 16 replacement caps that screw onto used plastic bottles and turn them into something useful. The caps include water guns, bubble blowers, paintbrushes, pencil sharpeners, spray bottles, soap dispensers, hand weights and condiment dispensers, to encourage people to reuse plastic bottles.
via Replacement Caps Upcycle Coke Bottles Into Water Guns and More | Gizmodo