Why is 6 afraid of 7?

Because 7 8 9!

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Knock Knock.

Who's there?

Tuba.

Tuba who?

Tube a toothpaste.

Funny knock knock jokes, silly one liners, tricky riddles, tongue twisters and more - Little Book - Big Laughs Joke Book was written by kids across the United States for kids all over the world. It delivers laugh-out-loud jokes to entertain children ages 4-12 for hours on end. Children can even customize their book by writing their favorite jokes in the lined blank pages provided at the back. With over 600 clean jokes to enjoy, this book is a must-have for any parent searching for silly humor in an easy to read format. And you'll be delighted to learn you're laughing for a good cause. By purchasing the Little Book - Big Laughs Joke Book you'll support medical grants given by UHCCF.