Ok
"Most people would say the whisper says, 'im still here.'
However, this is not the important part. The important part is when you listen to it backwards.
It says, 'Three letters back.' This code can also be called the 'Caesarian' code. At the end of every episode in the credits, the video is just to distract you.
It is this code up until episode 7...
... at which the code is... 'MR. CAESARIAN WILL BE OUT NEXT WEEK. MR. ATBASH WILL SUBSTITUTE.' The caesarian code is the 'Three letters back' code. The atbash code means switch a with z and b with y. Starting episode 7, the whisper backwards then says, 'switch a with z.'
And lastly... http://vigilantcitizen.com/wp-content/uploads/2012/07/gravity51-e1342191278670.jpg
So the triangle/pyramid thing in the center of the circle... that's illuminate. It's found in various places in gravity falls...
Now focus on the symbols that surround the illuminati.
The pine tree is Dipper because his last name is pines and it is the symbol on his hat.
The claw-looking symbol is Grunkle Stan, since it is the symbol on his fez.
The bag of ice is Wendy since she is 'cool' and is in every scene that has ice in it.
The question mark is soos, because he has the symbol on his shirt. It could also have something to do with the Mystery Shack.
The sunglasses could be Sheriff Blubs or Determined, since they both wear glasses.
The cross-out heart could be Robbie, because it is the symbol on his sweatshirt.
The shooting star is Mabel, because it is the symbol on her sweater. It is also because shooting stars represent optimism, something the mable demonstrates very well.
A lot of people would say that the llama is mable because it is one of the things on her sweater. But we don't think it is. When Larry King said that llamas are natures greatest warrior, it made us think... it's the greatest warrior in Gravity Falls manly dan?
The hand with six fingers is the author of the books that gideon and dipper have, since it's what's on the cover.