what am i

Andy's new favorite game is called "What Animal Am I?" He created it himself. We've been playing it for a few days.

Then it morphed into a boys' game: What Machine Am I? This one is tougher for me. He's a train. He's a digger. He's a road paving machine. He's a computer. (He sat on the ground and beeped.)

Next it became "What Dude Am I?"

Finally it was "What Old Thing Am I?" This was ridiculous. First he was a garbage can. (I can't imagine why I couldn't guess that.) Then he curled into a ball on the floor.

Me: Andy, you've got to give me a clue. You're not even moving.

Andy: You know why? I'm a penny!