Joe: Dad, look out! I have a reusable snowball! [Hits me with an icy chunk.]
Dad: OK, that's plenty of that.
Joe: I can use it again!
Dad: I know you can, but don't.
Joe: [Hits Dad with the chunk, again.]
Dad: And what did I say?
Joe: Sorry.
Dad: I know, when you have a weapon, it's hard not to use it. That's just how people are. Let that be a lesson.
Joe: I think that's YOUR lesson.