Vault Boy's Big Book of Laughs for Kids

Vault Boy's Big Book of Laughs for Kids is a book mentioned

Background
Knock Knock in Little Lamplight recites jokes from the book, which they found in the vault. She says that jokes were passed down and although they aren't funny, they are comforting.

Contents
The only two known jokes from the book are:

Appearances
Vault Boy's Big Book of Laughs for Kids is mentioned