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To "happen to" do something means that it is random or by chance. In the case of the video here, "happen to know a thing or two about scary" means that by chance she knows about scary things. You can use the expression "happen to" whenever you are expressing that something was a coincidence or was done by chance and was not known before. Ex: I happened to see my neighbor at the store today. Ex: The dinner she cooked for us happens to be my favorite.

You use the phrase "or so" as a way of saying that the number before is approximate and may actually be more or less. Ex: We will leave at nine, since the drive is an hour or so. Ex: My school raised two hundred dollars or so for charity. Ex: Matt got me a room there for a week or so when I first came here. Ex: The driver usually spends four hours or so helping to load and prepare his truck.

"Core" refers to the most central or important part of something. Synonyms include central, key, basic, and fundamental. Ex: My core mission is to make a positive impact on the world. Ex: The core idea of this essay is that mental health is as important as physical health.

501s are the trademark product of Levi's denim jeans. So, 'Bring those 501s a bit closer' is 'asking for someone (who is wearing 501s) to come closer'.

Both "this" and "a" actually work in this context. You can swap out "this" for "a" without changing the nuance of the sentence. Many people use "this" when describing things in conversation, but "a" also works well here. Ex: He's like this great big teddy bear. = He's like a great big teddy bear.

The main difference between "as usual" and "as always" is that "as always" implies that every time something happens, it happens the same way. Or something is "always" the same. I'd also say that "as always" is slightly more dramatic than "as usual" with the emphasis on "always". Whereas "as usual" means that it habitually or commonly happens that way. Maybe not time, but most times. Between the two, "as usual" is most common. Ex: As usual, Tim is late! Ex: He was rude, as always.

No, you can also use "store" to the physical things. Ex: I store the fuel for the winter. Ex: I stored my possessions in my mother's house.

"What time" is put after "at" in this sentence because she is using "what time" as a replacement for the specific time, which she doesn't know. Usually, the correct order for this sentence would be "what time did you get up at" or "at what time did you get up". The way she says it implies that she was going to finish her sentence with a specific time but she forgot or realized she doesn't know the actual time. So it is still correct for her to say this.

To "stay/remain civil" means that the state of things remains polite, calm, or cultured. We often use this expression to de-escalate a situation where impolite language or violence may be used. When things are no longer civil, they are hectic, rushed, hurried, or even violent. The speaker is stating that with proper time management, all tasks get completed on time and everything stays calm and unrushed. He has used this expression to add a bit of humor to his speech. Ex: Stop fighting! Let's keep things civil. Ex: No matter what happens, we need to respect each other and stay civil.

To "change" is to become something different. "Swap" is to give something for something else- to exchange something. So they didn't "change" their bodies to look like something else. They "exchanged" or "swapped" bodies. One body was given for another. Ex: I want to change my hair. Maybe I'll dye it blue! Ex: Let's swap places. You sit here. I'll sit there. Ex: I'm going to go change my outfit. Ex: Hey! Wanna swap clothes? I'll wear yours. You wear mine.