Dipper and Soos find the mysterious mailbox in the middle of the forest, without a house or an address. The two decide to test what would happen if they tried to mail a letter, expecting someone to pick it up. Instead, the mailbox rumbles and raises its flag, indicating it has a reply, with a letter appearing within. Dipper and Soos soon realize that the mailbox is omniscient and after several back and forths, Dipper decides to ask it who wrote Journal 3. Before he gets the chance, however, Mabel inserts a video of herself sticking one hundred gummy worms up her nose into the mailbox, intending to mail it to her mother. The mailbox finds the video disturbing and insulting, saying on a scroll that the age of human enlightenment will never come to pass. It then proceeds to first implode, then explode.
The mailbox is white with a wooden post and a red handle. It also appears to be old, rusted, mossy, and damaged from the outside. The handle is down most of the time but goes up when it has an answer.
- 3. "Mailbox"
- While the rest of its letters were without it, the first letter it replied with had a red wax seal with the infinity symbol on it.
- According to Bill Cipher, the being on the other side of the mailbox is "a real blabbermouth."
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