Board Thread:General Discussion/@comment-23960687-20131031121432

Here's a theory, Grenda might be related to the Werewolf Mailman and Gorny or one or the other. You have to notice that they have the same body types. In Summerween, when Gorny got eaten,only Grenda said "GORNY!". Since Dipper, Mable, or Candy didn't scream his name, they haven't seen Gorny in their lives. So Grenda might have a secret little brother.

One more Theory: (Let me point out that this isn't MY theory it's my friend's. So whoever writes a comment about this theory, I will tell him)  Mable is part english. I know, I know, its sounds crazy but it might be true. In Carpet Diem, when Mable said "Am I in YOUR body?" listen VERY closely. 