A girl lives in a house with her parents. There is a cellar door in the house, and her parents warn her to never, ever, open it because she's not ready to see what's behind it.

What is on the other side of the door that her parents don't want her to see?

is it a wine cellar...?

no. Its just a cellar.

At first I had my mind in the gutter. Then I watched a horror movie about a girl with abusive parents.... Her parents locked her in the cellar to keep her from seeing the rest of the world. It's not what's in the cellar, it's what's outside. The girl's in the cellar and her parents don't want her seeing the outside world.... Or is that wrong?

it has her brothers body on the cellar floor.
her parents are murderers

They don't want the girl to open the cellar. Which means leave the cellar to see the raping going on outside.

MURDERERS I TELL U!!!

This "riddle" has a million possibilities, her parents could be hiding ANYTHING from her, could be big like a dead body, or small like a stamp collection.

her parents are hiding *rubbing his chin* i got nothin

DEAD BODY!!!!!!!!!! eather that or strippers

i think its scary things

who knows it could be a cute puppy for all we know

i think is the infected or walker inside