Milestones: Waving Hi!

Kasen had already mastered saying bye as people were leaving, but to our surprise he started to wave at people when he first met them, too. Not just an open hand/close hand wave, but a real, outstretched fingers wave that nearly mimics how the royals do it. I haven't a clue where he learned it! It started maybe a week ago, and it resulted in him doing waving hi to our shih tzu, Aibo, our fan at home....and more recently, at the pretty girls at the table next to us at our neighborhood sushi joint. We're in trouble.