Simpsons Season 6, Episode 25: Who Shot Mr. Burns?: Part 1

Springfield Elementary strikes oil, and plans to spend elaborately. Mr. Burns finds out about the oil and establishes a slant drilling operation to take it for himself. As a result Moe's Tavern is closed, the Springfield Retirement Home collapses, Bart's treehouse is destroyed and Santa's Little Helper is injured, and the school loses all of its money. Burns next decides to build a machine capable of blocking out the sun over Springfield.