I mean, I assume the youtube video? I don't know, I didn't watch one that talked about chicken eggs. You'd need to say which youtube video you mean. My explanation came from me.
The answer is egg, because egg-laying creatures predate the chicken.
If we count it as a chicken egg only, then it depends on if you describe a chicken egg as "an egg laid by a chicken" or "an egg that could hatch into a chicken".
If you think stuff slips below your radar, that just makes me question how good your radar is. The problems are obvious if you pay even a little attention, so... Maybe you don't?
Evil Quest Giver: Yes, go and fight the dragon in this remote mountain and get treasure! I hope you survive, hehehe...
Party: (One week later) Wow, that dragon was kidnapping the locals and planning a conquest of the valley! Good thing we put a stop to that, huh?
EQG: Uh... Holy heck... W- Well, you're just the people to deliver this letter to this outpost in the middle of nowhere! Go now, take your time with the trip!
Party: (One week later) Turns out the guy you sent that letter to was researching occult rituals and accidentally unearthed a swarm of demons. We saved him and found this sword of sacred might.
EQG: Okay, plan C. Join me, and we shall overthrow the crown!
Party: The one terrorising the common folk? We were hoping there was a resistance group we could join!
Whether you're preparing magic for war or the bedroom, always have protection ready. And perhaps a few healing spells if you think it's gonna get rough.
People come here because it's big. It's big because people come here.
What if we went over there? What if we made the one over there big? Big, and entirely under the control of actual fans of anime who don't dismiss the entire medium as porn, I might add. Wouldn't that be better?
It's well known that ancient dwarves enjoyed the practise of banging rocks together through the shins of the elves. One day, the rocks sparked against each other and set the elf ablaze, and that is how dwarves discovered fire. They loved fire, and used it to set many, many elves ablaze.
From that day, it took 30 years to invent cooking.
I'm on team "tell the players", personally, because it lets the players customise their characters for the module. A group for Wilds Beyond the Witchlight are going to be different from Descent Into Avernus, for example.
(Of course, if a player decides to put Doom Guy in a fairy tale, that's perfectly fine, but it should be their choice.)
Also, a person who knows about Tomb of Horrors will figure it out pretty quickly during gameplay anyway because of those set pieces you mentioned, so it doesn't matter if you didn't tell them what it was. Heck, they might even have bowed out so they don't ruin things with their meta-knowledge, if only they knew what they were going to be playing.
It's not the action that's the problem, but the motive. It's fine not to tell your players, but it's a problem not to tell your players because you think they'll cheat if they know. One is inaction, the other is paranoia. If the GM doesn't trust the players, the game will be shit.
One of the most popular mods for Dragon Age: Origins is a mod that lets you skip the fade section of the game. So that's a pretty good indication of how people feel about it.
"But how were you able to make the casserole? Weren't you busy with the boss' plan?"
"Nah, let me go over the details of the plan and explain how I managed to fit casserole prep into my schedule."
"Ah hells. I know I don't exactly have a lot of useful information, but you could always ask me three more questions if you like. I might be able to give a vague clue to build deductions from. Just the three questions, though. No need to use up the entire spell tonight, right?"
Victim talking to Cleric: "No clue. I was stabbed from behind. They might try to kill me again, so maybe keep an eye out? Thanks for the resurrection, though. Those flames looked seriously unpleasant. I think I was robbed when I died, so don't expect me to pay you for the diamond."
Largiloquent: Bombastic.
Dithyramb: Ancient Greek improvised hymn about Dionysus.
You were almost coherent there, but not quite.