A major store sold me an expensive item that didn't work, and the store's return policy didn't cover it, so the store said file a warranty claim with the manufacturer. I just did a credit card charge back instead, because the store has to sell me something that works.

If for whatever reason the credit card charge back didn't work, I could use the store in (small claims) court and win.

AI: "The implied warranty of merchantability is a legal guarantee that a product will function as expected for its ordinary purpose, such as a toaster toasting bread. It is automatically applied to most consumer goods sold by merchants and does not need to be in writing."

In the EU (or maybe just my country of origin?) there is certainly statutory warranty. Length and coverage varies per product category.