A half-drunk cup of fresh juice and a refusal to refund it have turned a small Nha Trang juice stall into the centre of Vietnam's latest viral tourist drama.

The scene played out on the evening of September 15, when an Indian tourist ordered a fresh juice priced at 39,000 VND (roughly US$1.50) from a shop run by 37-year-old Tue Van. After finishing about half the cup, the customer announced the drink appeared to be mouldy and asked for his money back.

Staff explained the likely culprit: white foam that naturally forms on the surface when fresh fruit is cold-pressed or blended. That kind of froth is a normal by-product of juicing, not a sign of spoilage. The explanation didn't land. The tourist stuck to his claim, kept pressing for a refund, and the exchange — captured on video — escalated into the heated argument that subsequently spread across Vietnamese social media.

Van later confirmed he was the person seen arguing in the clip, and told Tuoi Tre newspaper why he wouldn't budge on the refund. Handing the money back, he reasoned, would amount to admitting the drink was tainted, when all his ingredients met freshness and hygiene standards. The customer eventually left, then posted a one-star Google Maps review laying out his complaints.

For travellers, the episode is a small but useful case study in how easily a misunderstanding can spiral in a busy resort town. Cold-pressed juices in Vietnam are often topped with foam or pulp that can look odd if you're used to carton juice, and vendors may not volunteer an explanation until a dispute is already underway. A quick question at the counter — what is that foam on top? — costs nothing and can save an awkward scene.

It's also a window into the other side of the counter. Shop owners in Nha Trang, where tourism is the lifeblood of the local economy, feel reputational damage keenly; a refund conceded under pressure can be read as an admission that the food isn't safe. Most disputes like this end quietly, but when a camera is rolling, both tourist and vendor end up defending themselves to the internet.

The takeaway isn't that Nha Trang juice is risky — it's that freshness in a tropical beach town can look unfamiliar, and that a calm conversation usually beats a confrontation. If something genuinely seems off, don't drink it, say so politely, and move on. And if you're ever tempted to demand a refund after consuming most of the product, remember that somewhere a video camera is probably running.