My Mum worked in a wallpaper factory which had a canteen that sold all the Corona soft drinks, they poured the drinks from those big bottles with the long cone-shaped necks with little bumps on. Outside the the back of the canteen they stacked dozens and dozens of crates for exchange with the delivery lorry each week. On a Saturday, when the crate stack was enormous, I'd sneak round with my mates each of us taking a duffel bag. We'd stuff 4 or 5 bottles in our bag and then a couple we'd hold under our jumpers. We'd choose a different grocers/newsagents each so they'd not suspect anything was up, then cash-in big stylee, spending it all on (obviously) sweets. After like 2 years the factory canteen finally cottoned-on and built a massive steel cage to store the empties in. Bastads. They empty Corona bottles were, of course, effectively currency !