My story... not so dramatic but still...

Mined dogecoins, got some small amount like 0.1 or 0.2 btc.

Traded them for maidsafecoins (bought then like 7000 of them)... they were on masterxchange... After I saw price dropping I just left them there... didn't even want to make an account somewhere to send them there...
Now they are like 0,34$ each... so that was my regret, for being lazy