When I decided to buy some Bitcoins in 2013, it was like wild west – price of BTC was skyrocketing from $100 to $1000, everyone was writing about it and exchanges were crashing from lame code, high load and hacker attacks.
At that time the biggest exchange in Europe was bitcoin-24.de, so I opened an account there, bought some Bitcoins and did some trades. But then it started receiving DDoS attacks and at one point transactions were duplicating.
If I bought 1 BTC, suddenly I received 2 BTC. If I sold 2 BTC, I got money for 4 BTC, etc. I got lucky to withdraw some bitcoins, but of course the withdrawals stopped working very soon, and I was left with an account “worth” 60k EUR and 7.7 BTC.