Grew up in Scandinavia, and in the mid-90's they started recycling glass and plastic bottles in the local food stores. You would put in the bottles in a machine, and it'd print out a receipt than you would then bring to the cashier and cash in. I remember the sum per bottle depended on the size, the sums being something like 10 and 20 cents a piece.
Anyway, I figured out that there was a space for an arm to grab the bottle after it passed the laser, meaning that I could use the same bottle multiple times - enter it into the machine, let it pass the laser beam, pick it up from the back, and then enter it again. For a small kid this was enough to get ice-cream or a soda or other unhealthy stuff, and I remember doing this for months until getting caught.
Also, in the times before the internet, the local phone company used to issue the phone catalogue once a year. If you didn't want it, you could return it and get a refund (it was otherwise deducted from your phone bill). If you didn't get it but still wanted it, you could pick it up in a designated store.
So me and my homie had a second x-mas once a year, when the new catalogues were being distributed to all households (by the mailman, when ppl were not at home). We would come back from school and run around in the neighborhood picking up the catalogues and then bring them to the store and cash in. One year I cashed in $300 on doing this... of course it didn't last more than a few years, until they stopped the system