Type in what you want the mockingbird to say. You mush click on him after typing in what you want him to say, and then you can type in something else for him to mock. Just don't type in nothing, as in blank, he will not respond and will tell you to click the green flag again. This feels like he could mock you forever! Don't worry if he is not there at first, he will pop up 2 seconds after you press the green flag.
Argggghhhh!!!!! TOO MUCH CODE INSIDE!!! (Take a look niside for proof)