sure bossk ill post a reply there. i think the answer to you question is that there are 2 endings, the theatrical version and the directors cut version. in the directors cut he goes back and kills himself at birth. a neat connection is that his mom had like 7 miscarrages b4 him, and as it turned out all of those miscarrages occured because thoses babys did the same thing as Aston kuchers charater.

the other ending has him go and scaring the shit out of the girl he likes, so tht she and her brother movie away thus taking her out of his life completely, and everyone grows up to be great.