Some kids in Pennsylvania got an assignment based on a popular book strictly meant for grown-ups.

FOX News Radio's Chris Foster reports:

Not "Harry Potter", not"Hunger Games"... some 8th graders in Monessen, Pennsylvania were given word search puzzles in class based on the book and now movie "Fifty Shades of Grey."

("Fifty Shades of Grey") "It's just beyond this door.//What is?//My playroom."

They were looking for words like "bondage," "spanking," "submissive," and "leather cuffs."

Parents complained at a school board meeting.

The superintendent says the incident is being investigated.

Chris Foster, FOX News Radio.