Haunted TV?!

So last night, I was in the mood to play the piano.
So I went to the living room where it's dark and everything is switched off. I switched on the lights, and proceeded to play the piano for a good half an hour or so.
Satisfied, I went to switch off the lights, and turned to leave when I noticed that the TV IS ON!!!
My eyes widened and I kind of ran all the way to the master bedroom where my mother is, sitting in front of the computer watching some video on youtube.

I WAS REALLY SCARED.

Me: (horrified expression)"Maaaa!! The the the...the TV IS ON!!!"
Mother: "Huh, TV is on? I thought I've already turned it off just now!" (in chinese)
Me: OAO (explains the whole situation to her) The TV is haunted!!! ;_;
Mother: Ahhh, then you help me off the TV la.
Me: Huh?! But but...I'm scared of the dark! What if some scary face appear on the TV?! TAT (The TV is on with a dark screen.)
Mother: Haiyo, scared of what? What scary face? (goes to the living room and turns off the TV)
Me: ...;_;

I didn't dare look directly at the TV after that for that entire night.
I also posted the incident on Facebook, after which my sister replied:

Knowing her, it's possible she wasn't joking. Maybe our TV is REALLY haunted.
But telling me right at midnight isn't going to help me calm my nerves down, sister.