You know that scene from Willy Wonka/Charlie and the Chocolate factory- the one where Violet turns into a blueberry? Well, there’s that (except Violet is Sweetie Belle and Willy Wonka isn’t a thing) and also Tirek is there and he likes cheese.
Pinkie invites her other friends to her chocolate factory and things start to go out of control and wacky, and the CMC are there to join them, and they are in for a very eventful day! (Warning: Contains weight gain and inflation)