Slime Doesn't Pay! - R. L. Stine

n nLots of little brothers can be pests and trouble-makers--but Amy's brother Arnie is a MONSTER...n nIn this R.L. Stine middle-grade scare fest, Amy and her friend, Lissa, don't know what to do about Arnie's bullying, bad-boy behavior, and mean jokes and pranks. The little monster is ruining their lives!n nThe girls decide it's payback time. Total humiliation for Arnie. They find a recipe for green slime on a YouTube channel and mix a big bucket to pour over Arnie at his birthday party.n nTo their horror, the girls instantly discover that SLIME DOESN'T PAY. Before their eyes, Arnie's whole body starts to change. The slime turns him into a real monster.n nNow Amy and Lissa have two frightening dilemmas: Can they save their town from the raging Arnie Monster? And is there any way to turn the monster back into Arnie?n