I will never forget those 600 spins in my entire life and I have said many times I will quit,but now I don't have any reason to play anymore as in less than 1.5 hour it swallowed 60 Eur with a min bet at 0.10 Eur.My conclusion is now firm,slots are controlled by evil software and I suggest you stay away from them.
I believe most of us here has experienced such bad run in slot game. I had bad experience on some slot games like reactoonz 2 where I lost around $100 without reaching the Gargantoonz Mode. Other experience, I played Deadwood by No Limit City for few hundreds spins but get one free spin bonus only. What makes it worst was that the free spin bonus gave me nothing (not even $1 win). On the opposite site, I could get huge multiplier on some other slot games like what I've just experienced this week when I participated on duelbits multiplier contest. Its all about luck dude, play the game for fun only, dont force yourself to spin too much. Use your feeling, if you feel that a specific game is not giving you good result then better to try other game.