The "$20 trick"—slipping a $20 bill between your ID and credit card at check-in to score a room upgrade—is primarily a Las Vegas phenomenon and has a much lower success rate elsewhere. In 2026, while it occasionally works in other high-volume "tipping cultures" like Atlantic City, Miami, or New Orleans, it is far less reliable in Europe or Asia where front-desk staff often have less autonomy over inventory. In Las Vegas, the culture of "greasing the wheels" is semi-institutionalized, and if an upgrade isn't available, the clerk will usually return the money. Outside of these hubs, the gesture can sometimes be misinterpreted as a bribe or simply result in a polite refusal. For the best chance of success in 2026, travelers are finding that "sandwiching" a $50 bill is becoming the new standard for luxury properties, as inflation has diminished the persuasive power of a single twenty.