Laugh out loud through history, fireworks, 4th of July parades and more In Knock Knock, Red, White and Blue kids will celebrate their country and laugh at the same time. Here's a silly joke for you: What did one flag say to the other flag? Nothing. It just waved Each page features an illustrated joke that is perfect for 4th of July celebrations and classroom lessons on government and civics.This collection of illustrated jokes is sure to get reluctant readers engrossed in their reading material. Knock Knock, Red, White and Blue is part of the Illustrated Jokes series from Brenda Ponnay. Other titles include: Fart-tastic Too School for Cool Knock Knock, Boo Who? Knock Knock, Moo Who? It's Snot Fair Knock Knock, Lettuce In Knock Knock, Blub Blub