Silent night, Startling night.....

I was all alone.My parents had gone out to buy provisions.It was relatively cool so no fans were on.I was completing a school project, while listening to music on my iPod connected to a 5.1 channel home theatre.The home theatre is not a high end model or anything but has 4000W P.M.P.O, which is more than enough for me.I attached no external amplifiers or such.
I was listening to Daddy Yankee's song 'Rompe'.For those who don't know the song-towards the end, it fades with some people saying 'who's this?'.I knew the next song was gonna be bad so I went near the iPod, ready to change it.The song faded completely, or so I thought.
Suddenly, I heard someone say 'who's this!' distinctly to my left behind me!!
I spun around, REALLY startled.I thought someone was outside and said that to scare me!Nonetheless, I cautiosly opened the window and looked outside with my flashlight.Nothing.I thought about it, and decided to play the last few seconds of the song.The usual 'who's this' played and faded.Then, distinctly louder but not enough to be heard if any other noises are present, was the real culprit-the last 'who's this' in the recording.It was placed SO strategically- right behind me!!!
I was so focussed on completing my project that I did'nt even consider that the speakers could have played it!!!