First event: flash crash on 21 Jun, price goes from $320 to $0.10 and back to $300 in a few seconds, this flash crash made someone a millionaire.
Second event: Ethereum was around -5%, Vitalik Buterin (founder of Ethereum) declared dead, price ETH reacts to this rumor and falls double digits, all the other cryptocurrencies follow

For me these 2 events show that the market is oversensitive right now and the smallest event can cause a crash. The market needs to become stronger in several ways. There is still a lot of space for improvements in the market mechanism.

Articles:
http://www.cnbc.com/2017/06/26/us-stocks-banks-oil-in-focus.html
http://www.ubergizmo.com/2017/06/ethereum-crash-wiped-out-and-minted-millionaire/
https://steemit.com/bitcoin/@oryn/ethereum-founder-vitalik-buterin-presumed-dead-in-a-car-crash-rumors
https://boards.4chan.org/biz/thread/2608981
https://cointelegraph.com/news/proof-of-vitalik-ethereums-buterin-immutably-counters-death-rumors

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