Book excerpt: Bestselling author Bob Phillips saves the day once again with another heroically humorous collection of knock-knock jokes. Kids can choose their favorite knock-knocks to liven up someone else's afternoon or just spend long family trips entertaining themselves. Perfect for bringing a smile to anyone's face, Super Incredible Knock-Knock Jokes for Kids will keep youngsters and their friends laughing for quite some time. Knock, knock. Who's there? A little boy. A little boy who? A little boy who can't reach the doorbell. With so much good clean fun in hand, kids will be able to astound their parents, defeat all signs of boredom, and have a wonderful time adding a little slap-happy silliness to people's lives.