public void TurnOnDVD()
{
_popper?.TurnOn();
_popper?.MakePopcorn();
_screen?.TurnOn();
_screen?.LowerScreen();
_projector?.TurnOn();
_projector?.ConnectToDVD(_dvd);
_projector?.EnableFullScreenMode();
_amplifier?.TurnOn();
_amplifier?.ConnectToDVD(_dvd);
_amplifier?.EnableAmbientSoundMode();
_amplifier?.SetVolume(5);
_dvd?.TurnOn();
_dvd?.EnablePlayback();
}