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Историческую версию Knocking on door (sound) prank можно получить на Android
Подшути и притворись, что кто-то стучит в двери!
Do you want to make a funny joke? Play the sound of knocking on the door and fool family that someone is really standing behind the door! App contains realistic sound of knocking on the door and it can be played in desired time. Just leave the phone near the doors and turn on the sound after e.g. 10 seconds. Everyone will think that you have a guest standing behind the doors!