https://www.penguinrandomhouse.com/books/323343/horrible-harry-and-the-green-slime-by-suzy-kline-illustrated-by-frank-remkiewicz/9781101076842/
Horrible Harry and the Green Slime by Suzy Kline: 9780140389708 | PenguinRandomHouse.com: Books
Harry leads a mission to place cobwebs all over school, shows the class how to make green slime, and stages a "deadly skit" that has everyone on the edge...
the green slime