Here is a concise summary of the provided transcript:
**Title:** Mysterious "Mummy Long Legs" Happy Meal Challenge
**Summary:**
* A group of friends excitedly purchase a new "Mummy Long Legs" Happy Meal from McDonald's, using a supposed "secret code" ("Can I have one Happy Meal with extra sauce").
* Upon opening, they find unusual items, including what appears to be a Huggy Wuggy (from Poppy Playtime) arm and mouth, and a cryptic letter.
* The letter warns that whoever reads it will be "taken over by Mummy Long Legs."
* Each time someone reads the letter, they seemingly become possessed, acting erratically and aggressively, before returning to normal with no memory of the event.
* The group ultimately decides to stop reading the letter, ending the bizarre and unexplained occurrences.
Here are the key facts extracted from the text, keeping each fact short and numbered, without including opinions:
**Order and Purchase**
1. The speaker goes to McDonald's to buy a "Mummy Longlegs Happy Meal".
2. To get the Mummy Longlegs Happy Meal, the speaker must order by saying "Can I have one Happy Meal with extra sauce".
3. The speaker customizes the meal with a hamburger, extra mustard and ketchup, fries, and orange juice.
**Unboxing the Meal**
4. The Happy Meal box is found to have a Mummy Longlegs theme.
5. Inside, they find a hamburger, fries, and a toy related to "Puppy Playtime" (contrary to the Mummy Longlegs expectation).
6. The toy appears to be parts of a character named Huggy Wuggy (arms, mouth, etc.).
7. There are also chips in the meal that are described as cold and stale.
**The Mysterious Letter**
8. A letter is found in the meal with a message from McDonald's.
9. The letter states, "Whoever reads this letter will be taken over by Mummy Longlegs. Goodbye."
10. After reading the letter, the person who read it (on two separate occasions) experiences a bizarre and unexplained reaction, leading to aggressive behavior.
**Aftermath**
11. The group decides not to read the note again due to the strange occurrences.
12. The video ends with the group members departing, seemingly ending the experiment or recording session.