Tell it to the marines
This expression is used to show disbelief at something that has just been said. It comes from the fact that in the past marines were considered stupid or innocent by regular sailors. They would believe anything they were told, even if it was something foolish or false. That's why when you doubt about what someone is saying you can yell at him this idiom.
Esta expresión se utiliza para mostrar incredulidad en algo que se ha dicho. Surge del hecho que en el pasado, los navegantes consideraban a los marineros como estúpidos o inocentes. Creían cualquier cosa que les decían, incluso si era algo tonto o falso. Por eso, cuando se duda sobre lo que alguien dice se puede emplear este expresión.
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