The phrase "whatever happened to predictability" is a line from the theme song of the TV show Full House. The song laments the loss of traditional values and the confusion of the modern world, and the line in question refers to the disappearance of familiar figures like the milkman and the paperboy. The song also emphasizes the importance of having someone to rely on in times of need. While the song is specific to Full House, it reflects a broader cultural nostalgia for simpler times and a sense of loss in the face of rapid change.