December 2013
http://www.bbc.com/news/technology-25428866
BTC went from $1200 to $380 in less than a month and continue to lose value for a full year.
September 2017
https://www.cnbc.com/2017/09/04/bitcoin-digital-currency-price-falls-on-china-ico-ban.html
BTC lose 10% value overnight.
What do you think will follow?
i dont think this is on par with the mt. gox hack
but its still pretty bad