You see it fade as the kids get older. It is very strong when they first learn to talk and communicate. But as they age, it slowly starts to disappear. That wonderful ridiculous sense of humor that children possess. The laughter that spills out of them when they ask you “What do you call a fish with no legs” and you rack your brain for the humorous answer and they blurt out before you can open your mouth “A fish!!”
Grown-ups would certainly not tell that joke. But they will certainly laugh at it. How can you not laugh along?