Testy two's?

My son is a thrower. He likes to throw things. I'm not a parent who likes making lots and lots of rules, so I simplified the rule to: no throwing objects at people. Easy, right?

Today, he threw his toy truck at me. He got a time-out. A kicking, screaming, crying time-out, but a time-out nonetheless. Right after his time-out, he went and picked up his truck. He got into his throwing stance and I asked him if he was going to test the waters and see if he gets another time-out if he throws the truck. He nods his head and throws the truck at me. Another kicking, screaming, crying time-out later, I get smart and take away the truck. I'm glad that he didn't throw any more trucks at me.