Go buy something with LN together. If no shops accept it in your area, buy a giftcard for some day-to-day product in bitrefill with LN and go together with them to spend it. Could be something as silly as buying ice cream in Walmart.
Practical use first. Once they feel the magic, there might be a chance to sneak the technicalities in.
I dont think buying a gift card is convincing enough.
Even if a merchant accepts it, most people will not see how it is better than VISA or using a high throughput centralized shitcoin.
What convinces people about base layer Bitcoin is the simplicity, soundness and trustlessness. If people don't see how those properties are kept in the LN, then I don't think people will be convinced.
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