“A boy is a noise with dirt on it.” - Anonymous
Little Johnny Stories IV
As any parent can attest, little Johnny, even at two years of age, can plot out a course of action to his maximum advantage just like you and I can. Yet he can sometimes make a startling mistake [just like you and I can]. For example, when he hasn't had his nap [translation: he's a little crabby], he just might shoot himself in the foot. Like, daddy lovingly says to him, "Johnny, how would you like to" - and before daddy can finish the part about going to the ice cream store Johnny blurts out "NO!"
Just like you and I can.
Conclusion: a crabby kid can be as foolish as a crabby adult.