A lighthearted beer toast on an American talk show has turned into an unexpectedly serious debate back home in Thailand. Lalisa "Lisa" Manobal, the 29-year-old global pop star from Buri Ram, appeared on The Tonight Show with Jimmy Fallon and brought along Thai beer, som tam and a chilli-eating challenge. She taught Fallon to say "mot kaew" — the phrase Thais use before clinking glasses — and the pair drank up to cool down after the spicy papaya salad.

The segment was pitched as a showcase of Thai culture ahead of her new album, Press Play, due out on Oct 23, which she has said will feature "many Thai elements". She even mixed a cocktail blending Korean soju, Thai beer and Sprite. Thai media lapped it up, praising the BLACKPINK star for boosting the country's "soft power" on a global stage.

Then came the awkward part. Thailand's Alcoholic Beverage Control Act of 2008 bans most advertising and display of alcohol brands, and Thai media outlets are required to blur images of alcohol in their coverage. Because Lisa drank the beer in the United States, she herself broke no law — but ordinary Thais sharing the clip or the photos online suddenly found they could be exposed to restrictions. Even the broadcasters celebrating her gesture had to censor her drink.

The incident has reignited a long-running argument about a law written long before the age of TikTok and influencers. People's Party MP Taophiphop Limjittrakorn, who was once arrested for brewing craft beer at home, says the real problem is that nobody knows exactly what the rules mean. Phrases like "using one's reputation to induce" drinking are vague, he argues, and the Alcoholic Beverage Control Committee should issue clear secondary regulations and publish a plain-language handbook spelling out what is fine — say, discussing alcohol in a cultural context — and what crosses into promotion. Public Health Minister Phatthana Promphat has played it safe, saying the case should not become a controversy, that the current law remains in force and that creators showing recipes without visible brands will be judged case by case.

Why should a traveller care? Because this law quietly shapes what you see and buy in Thailand. That cold Chang or Singha in your beach photo, the craft breweries of Bangkok and Chiang Mai, the widespread ban on alcohol sales in shops in the afternoon — all connect back to the same strict regulatory culture. And as Thailand leans harder into food and drink as reasons to visit, from som tam to its rising craft beer scene, the gap between how the world celebrates Thai flavours and how Thais are allowed to talk about them is only getting more visible. Lisa's toast may end up doing more than promoting an album: it has put a fussy, pre-smartphone law under a very modern spotlight.