"Tyrion felt the heat rise in him. "It was not my dagger," he insisted. "How many times must I swear to that? Lady Stark, whatever you may believe of me, I am not a stupid man. Only a fool would arm a common footpad with his own blade." Just for a moment, he thought he saw a flicker of doubt in her eyes, but what she said was, "Why would Petyr lie to me?" "Why does a bear shit in the woods?" he demanded. "Because it is his nature. Lying comes as easily as breathing to a man like Littlefinger. You ought to know that, you of all people."