Knock, Knock.

One of my kids reading a knock, knock joke book, and he wanted to share a joke with me today. It was hilarious, but not in the way you would think.

"Knock, knock."
"Who's there?"
"Jack."
"Jack, who?"
"Also included inside are 100s of other classic knock-knock jokes that will have you rolling on the floor laughing. Take a look inside to see!"

Yes, he was reading the teaser on the back cover, thinking it was a joke. Kids are fun.