Pretty sure the banana thing is from this video: www.youtube.com/watch?v=k4f9m4… (Caution: Video contains bad language, obnoxiously loud noises, and balls-to-the-wall hilarity.)The cake thing is probably just because she eats cake in a number of episodes. It really doesn't take much. Fans began to view Derpy as a hardcore muffin addict purely because of thethat she might have uttered the word 'Muffins' in the episode 'Applebuck Season'!