Joseph recently learned the word "dirty." Well, he learned to say the word "dirty." We're still working on connotation. He knows that if I tell him that something is dirty he isn't to touch it (and he generally doesn't). But, if I say "yucky" he says back "dirty." Which, as we all know yucky and dirty aren't synonyms.
When I referred to his hours-old, browning, disgusting-looking, cut-up banana from breakfast at 3 o'clock in the afternoon (which he asked to eat) as "yucky" he immediately responded "dirty." All I could think was "weeeeeellll, not exactly, but I'll take it. And now I'm going to clean your tray."
When he began to grab at the lamp I said "don't touch that, you'll go directly into time out" he said "dirty." Again...close, but not quite. At least he associates "don't touch" with "dirty," right?
While we continue to work on his understanding of the word dirty I'll just revel in the fact that he has become so proficient at another new and exciting word.