French cafés legally have to post two prices for the same drink: one for standing or sitting at the bar (comptoir), and a higher one for sitting at a table (salle). It's not a scam and it's not a tourist tax — it's a real, published pricing structure, and locals use it constantly without thinking twice.
Order an espresso standing at the bar in most Parisian cafés and you'll pay something close to €1.50–2. Sit at a table for the same drink and the price can nearly double. Neither is "correct" — they're just different products: a quick coffee versus a seat with a view for as long as you want it.
The etiquette that actually matters
The bigger giveaway isn't the seat — it's the order. Ordering a cappuccino or any milk-heavy coffee after roughly 11am reads as unmistakably foreign to most French servers. Milky coffee is treated as a breakfast drink; after late morning, the standard order shifts to espresso (un café) or an espresso with a splash of milk (une noisette).
None of this is really about avoiding a few extra euros. It's a small, low-stakes way to move through a place like someone who's spent time there rather than someone just passing through — and cafés are one of the easiest places in Paris to feel that shift happen.