I think, there is no difference first, second or third game, if you are lucky enough at that day, you win, that's all.
That's all and it comes usually to the beginners so we therefore conclude that beginners luck is true. I believe that it comes to the right person but not all the time its applicable to every beginner that is gambling. The only thing that I can say if a beginner is lucky that will push him to play more.
Once a while you can become lucky or in start you may just win and consider it as a the best lace to make money quickly. Later you would realize that you have started to lose and as a result will play more to win more and recover the loss amount. Chances of getting addiction increases from here.