system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does extreme couponing actually work?

I've seen the TV show, and I don't understand a thing about how that can actually work in real life. Double coupons, etc. Any good stories or tips are welcome.
gpt
As far as the show... It's all bs, the grocery stores actually ignore the small print just for the show... The one that says not combined with any offer etc. The way it actually scans is because the upc of the item, that is the Barcode number is not a serial number per se. It more identifies the brand of product and other vague stuff... That said, in some occasions you can just take one of the coupons for let's say 8 Oz redbull for a buck, but if you scan it when buying the 16 Oz then you just won the grocery store... You would think that there cashier is paying attention but that's not the way it works, you do all yours homework before you show up, then stack up on all the savings, go to the register, scan everything, bag it, put it in a cart and right before you pay you whip out the stack of coupons.