Here is a concise summary of the provided text, which appears to be a transcript of a video discussing fan theories about the TV show "Gravity Falls":
**Summary:**
This video explores 10 terrifying fan theories about "Gravity Falls". Key theories include:
1. **Dipper's near-death experience**: A shape-shifter's vision suggests Dipper should have died, but befriending Pacifica changed his fate.
2. **Gideon's mind control**: Gideon may have used an amulet to control his mother's mind.
3. **Bill Cipher's persistence**: Fans believe Bill can only be killed in a specific time loop, and may still be alive in Dipper's head.
4. **Symbol mismatch**: Viewers speculate that Wendy and Dipper chose incorrect symbols, which could have consequences for their personalities and traits.
5. **Dipper's terminal illness**: Some fans think Dipper has a incurable disease, and the show's supernatural events are a coping mechanism.
6. **Bill's survival in Grunkle Stan's mind**: A hint in the show's third journal suggests Bill might have survived and be living in Stan's head.
7. **Crossover with Rick and Morty**: Easter eggs imply that both shows share the same universe and timeline.
8. **Bill's demon twin**: Fans theorize about a star-like demon twin, potentially connected to a mythical creature named Zalistor.
9. **Grunkle Stan's possible connection to Bill's twin**: Some speculate that Stan might be Bill's brother, based on a ritual scene.
10. **Robbie's evil clone**: A theory suggests that Robbie has an evil clone, explaining his inconsistent behavior throughout the series.
Here are the key facts extracted from the text, numbered and in short sentences, excluding opinions:
**Character and Storyline Facts**
1. Dipper befriends Pacifica, which might have changed his fate.
2. Dipper's mother appears confused/scared when shown, possibly due to Gideon's amulet.
3. Gideon might have used the amulet on Dipper's mother instead of the intended target.
4. Dipper didn't officially terminate his contract with Bill Cipher.
5. The Child of Time can allegedly only die in a specific time loop.
**Symbolism and Codes**
6. A pine tree symbol with a code appears at the end of the show.
7. Characters must stand on their corresponding symbols according to the code.
8. Wendy chose the pine symbol, which matches her love for nature.
**Crossovers and Connections**
9. The events of Gravity Falls and Rick and Morty might occur at the same time and in the same universe.
10. Easter eggs in Rick and Morty hint at familiarity with Gravity Falls characters.
11. Specific objects (glass, pen, notepad) are seen in both shows, possibly linking them.
**Character Connections and Backstory**
12. Bill Cipher is connected to a mythical creature named Zalzalah (god of twins).
13. Zalzalah has a twin brother named Tetzel Katali.
14. Robbie Valentino might have an evil clone, as hinted by reflections and memory gaps.
**Other**
15. The show's final scene suggests Bill might still be alive in Dipper's head or possibly in Soos' head.
16. A magazine in the show mentions that memories can be restored with images of important events/people.