Stand back...

A few weeks ago, Mama got Aidan a hooded bath towel that's shaped to look like a dragon..

So now, after bath-time, Aidan runs around the house, roaring like a dragon.
Mama: "Oh no! It's a big scary dragon!"
Aidan: "Oh, it's okay Mama," Aidan says, lifting the hood of his towel, "it's just me."

And occasionally, while he's running and roaring, he'll stop, turn to you and say, "Stand back. I'm going to breath fire!" And then he heaves a big intake of breath and blows a big imaginary fireball into the next room.