So, 4th wall breakage, Dark Matter Applejack, Chicken Scootaloo, Marshmallow Rarity, Tree Fluttershy, bacon-haired Twilight, & Colgate toothpaste. …Yep, that about sums up my Saturday mornings.

@supermonday
It's a reference to that physics presentation on MLP from a while back. The guy doing it pointed out that Rainbow Dash gets launched from the catapult higher than is physically possible during episode 4. He said that it could work, but only if Applejack was made of dark matter.
Link to video here, he says it at about 5:38