Board Thread:General Discussion/@comment-25787630-20150819221808/@comment-26327296-20150821053003

It probably has something to do with Bill. But I also think it could be referencing the growing gap between Dipper and Mabel. The 'small things can have chain reactions' could be pointing at the small change of the two twins hanging around one Stan more often, and starting to sympathize and bond with them more, could lead to the chain reaction of them becoming 'Stupid', as Mabel put it in "A Tale of Two Stans" aka them ending up fighting and going on seperate paths and all that.