Good old fashioned insults

 Getting ready for school this morning, Thing Three was slapping some Goober on his sandwich and had a lot in the middle but there was still a border of white all around it. I asked if he was going to add some more and he said, "yeah..."

"It works better if you stir it first, regardless of what your brother says."

"My brother is a *mumble*."

"Did you say your brother is a nincompoop?"

"No, I said 'buffoon' but that works, too."