"It's just a theory" is the most irritating and ignorant argument made by science deniers, but you can't correct them without sounding like a pedantic asshole.
That's one thing (of many) that really annoyed me about MatPat's "theory" channels is he used that as a slogan. He's hailed as this great YouTube educator yet continued to happily perpetuate the misconception that "theory" is synonymous with "tenuously connected set of ideas formed from 3 hours of Googling stuff in your underwear".
Yeah, that one stood out to me, too. The green guy saying "it's not a theory" is incorrect - it's just not the colloquial definition that the blue guy is using. Why couldn't "hypothesis" have been used instead, since it's closer to the definition you said at the end of your comment? "But that's just a hypothesis - a game hypothesis!"
Natural History Docent: “A guy asked us ‘If I had a time machine, and managed to kill and cook a T-Rex, what would it have tasted like?’ and every paleontologist on staff deciced to take him seriously. They did research to learn about fat distribution, and read up on culinary science to learn what flavors meat, even did chemical analysis on the bones. They concluded that it’d be Tough (no evidence of juicy fat pockets), bitter (carnivores tend to taste foul) and would probably kill him, because heavy metals travel up the food chain and T-Rex accumulated a lot of the cadmium that was in the dirt in the late cretaceous. Wrote him a letter with our findings and he sent us back a drawing of him and his buddies cooking a T-Rex over a fire and all of them throwing up and dying, and it’s my favorite drawing in the whole world.”
For some reason, my memory was really confident that this was a question on Randall Munroe's what if? blog, but I couldn't find it. I even checked the copy I have of the first what if? book to be sure it wasn't in there lol
It's an extremely Randall sort of question and answer, to be fair.
But holy shit, some of these other ones are amazing. The T-Rex question isn't the only one in there worth reading.
Professor: “A student asked me “So how do I use this in a conversation when my aunt is wine-drunk at thanksgiving and being a jerk again?” Which honestly is a fair question about philosophy and really changed how I teach rhetoric.”
Philosophy? That's specifically Abraxas from Gnostic Christianity, so more about theology than Philosophy.
Abraxas (or Abracax) was an anguipede (a deity represented with snake feet) pagan God of "Asian theogonies" with a "rooster's head, dragon's feet and a whip in his hand".
"The bird fights its way out of the egg. The egg is the world. Who would be born must first destroy a world. The bird flies to God. That God's name is Abraxas."