It's an egg

It's an egg

Tim: Toby! This is a good trick, look! What's this?
Toby: It's an egg!
Tim: And what's that on the table?
Toby: It's a box!
Tim: That's right! Now: Where's the egg? Is it in the box?
Toby: Yes, it is.
Tim: Ok. Now look: It isn't in the box.
Toby: Where is it? Is it under the table?
Tim: No, it isn't. It's here: Catch!
Toby: Yuk! The egg's bad. It's a silly trick!