Where do they come up with this stuff???

Today, eavesdropping on 3rd grade tutoring club over the course of ten minutes.  I was sitting in the back of the room stifling snorts of laughter and failing to get any work done.

Names have been changed to protect the innocent.

(Studying suffixes -less and -ful)
Ms. F: "Can you use harmful in a sentence?"
Manuel: "A catful is harmful."
Ms. F: "What's a catful?"
Manuel: "You know.  A catful.  It can scratch you."
Ms. F: "Do you mean a cat?"
Manuel: "Oh.  Yeah."

Manuel: (interrupting silent work time) "Did you know?  I am part bloodhound."

Manuel: "If you stare at the sun you see sparkles.  Like right now, I can't see you, but I know you are there."