Peering over Yellen's shoulder as she testified that she opposes audits of the Fed, A couple of boyish-looking chaps, quietly raised a yellow legal pad on which they'd scrawled "Buy Bitcoin" in black ink.
The photobombers may have hoped their guerrilla stunt, which lasted only about a second, would counteract some recent bearishness in virtual currencies that has driven a month-long selloff. Cryptocurrencies as a group have lost 23% in value so far this month. Bitcoin is down more than 20% since its peak of $3,000 in early June, while Ethereum's price has fallen 50% since its high of more than $400 around the same time.
http://fortune.com/2017/07/12/bitcoin-buy-yellen-fed-testimony/