Homer Builds a Nuclear Reactor

Homer is in an abusive family. Flashback, we see Lisa shouting verbal abuse at him, Bart disrespecting him and Marge beating him. He's so tired of the same old family, but he has no where else to go. In the night, he tinkers in the basement. Lisa comes down to check on him, and Homer laughs maniacally, he threatens to dipose of the whole family. We then see the house ignite.