Double ones, or 'snake eyes'
A Double occurs when the two dice show equal numbers. In Monopoly, when someone gets a double, they can take another turn. However, if they got a "Triple Double" (Hitting 3 doubles in a single turn), then they are considered to be "speeding" and must go straight to jail without completing their 3rd run nor getting anything. They may use a Double to get out of jail as well. If they do, they must end their turn after performing all actions, and resolving all the debts if any.