I lost 0.5 bitcoin to an altcoin because the dev scammed and ran off with all the money . this kind of behaviour seems almost normal in the world of altcoins though. It doesnt really bother me too much now apart from always thinking i could have that little bit more bitcoin had the dev not been a total scumbag.
Which coin?
The coin was droidz, It had various swings after the dev left and there was the possibility to gain back some of the lost funds through trading but the price finally dropped down to whatever its at now which is something like 50 sats. A new Dev has taken over it now and is trying to make a comeback with it so if anything happens with it , it might be worth jumping back onboard. I bought in at ico and it never went back to ico price after launch if i recall.