The twenty-dollar bill method is a popular, informal bankroll management strategy and superstition often discussed among casino patrons playing slot machines. The strategy involves inserting a single twenty-dollar bill into a machine and selecting a fixed, relatively low bet per spin, with the strict personal rule that if the balance drops to zero, the player immediately walks away, whereas if they secure a profitable win, they pocket the original bill and play solely with house credits, though mathematically it cannot overcome the house edge.