Logan's sense of humor

Tonight as I was feeding Logan and tucking the boys into bed for the night, Caleb wanted to share something with me.
Caleb- "Guess what, Mom. You can tell how smart someone is by the size of their face."
Me-"Huh?"
Caleb- "It's true. There's this fourth-grader at school..."
Me-(interrupting) "He has a big head so he thinks he's really smart?"
Logan-(busts up laughing, his very amused belly-shaking laugh)
Me-(also laughing) "Was that funny Logan?"
Caleb-(joining in laughing)
Logan-(laughing harder)
Me- "Was that one of your classmates, Logan? With the big head who's really smart?"
All of us- (still laughing, still amused)