Why is Pie always exploding? She's a blueberry pie, and in BFDI, blueberries are explosive. She'll detonate when her emotions get the best of her, or when a fork lands on her, to name a few causes. Pie is mellow and laid-back, even though she's explosive. She can be easygoing about many things, and can contort herself in all sorts of weird positions, bending her arms and legs in unnatural ways.