 Shelbyville kids hijack Springfield s sacred lemon tree after being pelted with lemons, and Bart leads a guerrilla war against them (I say a war, but it s nowhere near violent.) They find out that the tree is in "the impenetrable fortress of suburbia"- a car impound lot, owned by the leader s (Shelby s) dad. Homer and the parents of the kids find them and team up with them to get the tree back. But how are they gonna get it from a car impound lot?