Dipper and Soos find the mysterious mailbox in the middle of the forest, without a house or address. The two decided to test what would happen if they tried to mail a letter, expecting someone to pick it up. Instead, the mailbox rumbled and raised its flag, indicating it had a reply. 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 100 gummy worms up her nose, to mail 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.
- 3. "Mailbox"
- While the rest of its letters were without it, the first letter it replied with had a red wax seal with an infinity symbol on it.
- It was revealed in Alex Hirsch's reddit with Bill Cipher that "[[[Bill Cipher|he]]] know[s that] the guy on the other side is a real blabbermouth," implying that the mailbox may not be as sentient as it seems, and that an otherworldly omniscient creature (similar to Bill) is the owner.
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