goosebumps: it came from beneath the sink

Kat and her brother Daniel just moved into a new luxurious house. it was huge the was an enormous garden and wonderful rooms, Kat got the one with a balcony. thinking she was the luckiest person ever she explores the house.  her dog then finds an old sponge beneath the sink in the cupboard. Kat shows her brother and they find that the sponge was breathing. of course their parents didn't believe them when they showed them an old wrinkled sponge. bad things start to happen, a tree almost falls on Kat, her teacher slammed her fingers in a desk, her dad falls of the ladder and every time the sponge seems to be breathing harder and getting more colour. they eventually find out what it was, it was a grool. a grool was a 'mythical' creature that gave the owner bad luck, you cannot get rid of it by any means of violent forces and if you give it away you will die within a day...