It must have been the long Thanksgiving break from preschool.

My 3 year old, who used to love school and ask me every day, "Mom, is it a school day today?" has had a complete change of heart. He doesn't want to go. Last week, I had to bribe him with promises of hot cocoa and a cupcake after school just to get him in the doors. When I dropped him off, he actually cried. It's the first time he's ever done that.

On Fridays, he has lunch bunch, where he brings his own lunch. I sat him down, opened his lunch, and he was sniffling. I asked his friend Parker if she could help keep him company since he was feeling sad.

"I'm feeling a little bit sad, too," she said.

So a boy sitting across from them said, "Knock-knock."

Everyone, especially me, brightened. "Who's there?"

"Orange."

"Orange who?"

"Orange you glad I didn't say banana?"

And they all took turns telling completely nonsensical knock-knock jokes, laughing hysterically, no matter what the answers were.

I love 3 year olds. They know just how to cheer each other up.

Anybody have some 3 year old appropriate knock-knock jokes to tell?