Why Must Read Jokes for Kids: The Best Jokes, Riddles, Tongue Twisters, Knock-Knock jokes, and One liners for kids: Kids Joke books ages 7-9 8-12?

I like how much my son loves reading and sharing these jokes. It's one of his favorite things to do and this book was perfect for that. I don't like that this is geared for kids yet there is a joke in it that regardless of how cute it is, references bad language for kids: what does a fish say when it hits a wall? Dam. (I'm paraphrasing but the joke is a play on the word "dam"). This kind of language should not be in a kids' book. I shouldn't have to monitor this and was pretty shocked when my sub shared the joke (telling me the book says a bad word). I know we can't shield him from everything but putting the age range as young as 7 is not appropriate in my opinion. That kind of joke is fine for older kids but not a second grader.