Vault Boy's Big Book of Laughs for Kids is a book mentioned in Fallout 3.
It was made by Vault-Tec, and the single known copy was found by Knock Knock inside the Little Lamplight caverns. Knock Knock says that the jokes are not very funny, and asks that the Lone Wanderer tell her some more. However, it is not seen in-game and is mentioned only by Knock Knock. It may have been distributed to all the vaults, and Knock Knock states that their copy was found when the Little Lamplighters still had scavengers going into Vault 87.
The only two known jokes from the book are:
"Noah place where I can get some food?"”
"A big red rock-beater."”
Vault Boy's Big Book of Laughs for Kids is mentioned only in Fallout 3.