piece of crap (idiot boyfriend): "No, you drop it!"
mom: "Can you just grow-up already??"
piece of crap (idiot boyfriend): "Make me!!" *in a mocking voice* "Can't you just grow-up already??"
Piece of craps; a word in which a pile of crap is made up of many other craps. (can be used hypothetically as well as literal)
Steve: "What does that mean?"
Bob: "Well, everyone in my town are a peice of crap, so since my town holds all of the craps--people--it is a piece of craps."
Steve: "Ooh, I guess that makes sense"