Summer 2012. Diablo 3. I bought in game gold with bitcoin @ $3/btc - Spent 90 coins for 500 million in game gold.
IGG = 35 cents / million now.
I lose.
/wrist
Worst decision that I made in my life is believing and investing into scam bitcoin doubler site . I trusted the site not knowing the it was listed into the scam list. That is learning for me which basically teach me to do checking and validation of the investment site legitimacy before investing.
There comes so many occasions in your life when you make some bad decisions due to which you feel regret in the future. In my opinion, every time you do such kind of thing you are actually learning something good which can help you in your future.
I feel regret of only one decision and that is not to invest my money in bitcoin at the time when its market value was hardly 3000$.