*Human Vinyl Scratch starts flat out devouring Human Pinkie Pie's cake*
Human Pinkie Pie: Vinyl, why do you like cake so much?
Human Vinyl Scratch: My mother.
Human Pinkie Pie: What about her?
Human Vinyl Scratch: Cake is her favorite food. When GLaDOS captured her and tortured her with her sick experiments, she deprived my mom of cake. Now that GLaDOS is dead and she's free, she eats cake whenever she can. Her first date with my father was at a cafe, when she ate a whole cake. Thus, she raised me to love cake as much as she loves it.