Door Number Three

What's behind 

door number three?

You're already thinking:

"Ah!  A mystery!"

You really, really, really,

really want to know.

If I said I won't tell you,

you'd shout: "That's not fair!"

If I said there is no

door number three;

"Why did you say so?!"

you'd interrogate me.

Really, only to mess

with your mind...see?

How easy!

But wait, don't give up!

There's still something more!

What do you think is behind

door number four?