The T-Rex salute

I was biking home from work today, and while I was waiting at a light, I heard this "rowwwwrr!" noise. I turn to look, and there's a young boy (maybe two years old?) in the back seat of a car with his window rolled down, and he's making the biggest dinosaur face at me, to accompany his noise - complete with the clawed hands and many bared teeth. So naturally, I growled/roared back at him, which seemed to please him greatly. He laughed, and gave me a dinosaur salute - one arm outstretched, with a claw hand on the end.

I tell you, when you're biking in the cold, drizzly weather, nothing cheers you up like a random dinosaur encounter. Rooowwwwrrr!