I have been finding bits of asphalt in the washing machine lately, along with thick twigs. I could not figure it out. This morning I found this in Tre's closet. In multiple "hidden" drawers.
Apparently he has been chipping away at the asphalt on his playground, he then hides the pieces in his pockets (thus the washing machine), and sneaks them home and is storing them in his room. He told me they are special grenades and radios. He uses them to fight the girls at his school.