Playing "roar" in the garden

Wolfie has developed a liking for our back garden. He didn't use to, but now he loves to play there when the weather is nice (and sometimes even when it is not so nice). His favourite game is playing "roar": basically he says "roar" and runs after us as if he was a wild beast or a monster or something. Then he laughs hysterically. But he does not like if we do "roar". He is the one who must roar. We need to scream in fear and run away. I have to say, it's quite a fun game. Before I became a dad, I had always hoped that if I had a boy, he'd be boisterous and liked to rough and tumble. I am so glad Wolfie is. And that he loves playing "roar".