We had a get-together for two of my brothers' birthdays (they both have birthdays in early December) and my 12 year old nephew asked me to walk him through D&D while we were hanging out. If you ever have someone brand new ask you for a walk-through, I HIGHLY recommend using the technique Deborah Ann Woll used in that interview with Jon Bernthal. My nephew had read enough online to know he wanted to play a paladin, so I just walked him through "you've been asked to slay a monster that attacked a village." No paper, no writing, but we did use the set of dice I keep on my keychain - I didn't even name the skills he was rolling for, I just said "so you're really good at listening, so roll a d20 and just add three to it" and so on.
And his ten year old brother was eavesdropping, so we invited him in, and I ran another five minute scenario. He wanted to be a wizard so I just made up spells for him. I want to throw the goblins in the air." Okay let's see if the goblins can dive out of the way of your spell or not.
It was really just TTRPG Lite but it got them into the idea of how you can kind of do anything, and you roll some dice to see if it works. They got some nat 20s and a nat one and I showed them how failing can be fun (so you don't see the owlbear... but the owlbear sees YOU!") And now they want me to run them a real game with a map and everything. Maybe get one of their cousins to play too.
And, weirdly, my nephew is officially the only person I've ever met who asked to learn D&D because of Stranger Things. I keep hearing about how the show looped people into the game but didn't believe it.
Anyway, he downloaded the DnDBeyond app on the way home and sent me his first characters sheet, Sir Juniper, about an hour ago. Fricken adorable, man.