Somewhere in the Gravity Falls Forest, Dipper says he's going to investigate anomaly #54, a mysterious mailbox in the middle of the forest, with Soos coming along as Dipper's "team of expert." Soos places a piece of paper with "'SUP, DAWG?" written on it in the Mailbox and closes the lid. Seconds afterwards, the Mailbox begins to shake violently and the flag on the side magically moves. The duo shouts in fear. Dipper opens the Mailbox to see their letter has been replaced by a scroll that reads "HELLO DIPPER AND SOOS." Soos wonders if the Mailbox is all-knowing, and the duo decide to ask it more questions.
Soos decides to ask the Mailbox "WHAT DID I SHAVE INTO MY HEAD THIS MORNING?" and the Mailbox again answers correctly: a duckling with a paddle-ball. Soos thinks they should ask some more questions. Dipper decides to ask when the world will end (3012), while Soos decides to ask it what his dream woman looks like, to which the Mailbox gives him a drawing.
Finally, Dipper ponders what to ask the Mailbox, from when his death will be to the meaning of life, with Soos desperately trying to ask if aliens built the Pyramids, and what marshmallows are made of. Finally, the duo agree: learning who wrote Journal 3, one of Gravity Falls' greatest mysteries. However, Mabel arrives and puts a video of her sticking 100 gummy worms up her nose into the Mailbox, thinking it will be sent to her mom. It is replaced with a letter that reads "Your gummy worm video has disturbed and insulted me. You fools are unworthy of my great knowledge. The era of human enlightenment shall never come to pass." As Dipper finishes reading the letter, the Mailbox collapses in on itself and explodes. The short concludes with Mabel attempting to put more gummy worms up her nose and Dipper running toward the camera to turn it off.
- Mabel is able to stick a hundred gummy worms into her nose.
- Dipper is interested in the identity of who wrote the journals.
- Soos is aware of Journal 3.
- Soos's "dream woman" is apparently a muscular, body builder-type woman.
- The wax stamp on the first letter is stamped with an infinity symbol.
- At the end of the short another section of the hidden page was revealed. The code made by the red numbers decodes to "BLIND HEL."
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