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On July 12, 2017, Christian Langalis (then a 22-year-old intern at the Cato Institute) sat behind then-Federal Reserve Chair Janet Yellen during her live testimony before the House Financial Services Committee. Langalis hastily scribbled "Buy Bitcoin" in all caps on a yellow legal pad and flashed it behind Yellen’s head on broadcast. He was quickly escorted out of the room for violating committee rules, but the image immediately went viral, cementing him in crypto lore as the "Bitcoin Sign Guy." At the exact time of his stunt, Bitcoin was trading at roughly $2,400.