The expirament that went wrong

Previously

…As Phineas began to gather the remnants of the burnt toast, Mary noticed something peculiar. The smart fridge, Joseph, was still humming with a faint, almost imperceptible oddity. She opened its door, expecting the usual array of chilled delights. Instead, nestled amongst the milk cartons and yogurts, was a single, perfectly golden brown slice of toast. It was, without a doubt, the most beautiful slice of toast she had ever seen. And then, from the depths of the fridge, a tiny, almost inaudible whisper seemed to emanate: "We’ll meet again…"