i love it

might be harder to pull off if you're buying goods though. it implies the merchant was giving away, at a loss, their products to you, which is unreasonable.

they'd need to be in on it and also have their own sign about how they are running a special where they discount their goods 100% for bitcoin transactions. then you say "oh wow thanks for giving me this for free!" and present your card and ask them to put X amount into their square terminal so you can send your gift.

and you'd still both get arrested.