Ha! You haven't seen this child. He's smart and knows what to do. He's 18 months old and still in a high chair thus can not get up to put his plate in the sink. And when "he's" done is not when the rest of us are done. I refuse to let the babe run the routine. He will eat what he wants to (usually the carb, pasta, bread, etc) and throw the rest. This is two fold bad because we have a dog that is allergic to corn so if he throws a plate with corn on it she's bound to consume some before I can clean it up and thus gets the craps. I'm not trying to teach him what to do with his plate when he's done, again he's 18 months old; I'm enforcing that throwing dishes is bad.
He was (see was) throwing cups as well and not just at the table. You open the fridge, get the bottle of juice, milk, etc, he goes for the bottled water or beer or a can of soda. I take whatever he's grabbed while I was getting the juice and put it back, proceed to getting him a sippy cup of juice and hand it to him, he chucks it across the kitchen because it's not what he wanted. He's not even old enough to understand that he didn't really want the beer he grabbed he just wanted it because it's different I suppose. A few good slaps on the hand and majically the cup throwing has pretty much stopped.