The former three inventions led to the world becoming lazy and obese, leading to widespread waste. The invention of hoverboards led to hovercars, which led to people throwing their trash out of the windows, causing a great trash storm in 2021. All of this trash needed to be disposed of, which led to 100 million Mr. Fusion units being manufactured. All of the Mr. Fusion units had a tiny nuclear reactor inside, and all of them detonated on October 21, 2045. The chain of events that led to this happening began less than twenty-four hours after Marty caused Griff Tannen to crash his hoverboard into the Hill Valley Courthouse when Griff was sentenced. He vowed to get back at the world for laughing at him and planned to do it through a company that he would found, GriffTech.