String or nothing

PTR

Guess what's in my hands?

Hatchling

Keys!

PTR

No, guess again.

Hatchling

Keys!

PTR

No, not keys.  What's in my hands?

Hatchling

Keys!

PTR

Nooooo.  Try again.

Hatchling

Duck!

PTR

Haha, not a duck.  I couldn't fit a duck in my hands.  What is it?

Hatchling

Poo!

PTR

That's a good guess, but no.