Someone knocks on the front door

Sitting on a bed he picked up his phone. Turning on the screen he is welcomed with an unfamiliar application with a big title "Reality Edit App" and only two buttons under - "Start Reality Alteration" and "App Information".

Clicking on the info button he is presented with a long text explanation of how the app works.

"Bullshit! Is a reality-altering application unable to change people around? How can I believe this?" He face-palmed his forehead. But something was intriguing about the application. "What if it's true? There's no hard-to-try app before I'll toss the phone away."

Just as he wants to test it further someone knocks at the front door. Kate calls for John to go open because she is busy right now. John reluctantly stands up and walks downstairs to open a house entrance. And behind the door he spots...