I made sure to put in a faulty light bulb before I sent my sister down in the cellar to get something
How shady is that? Why wouldn't you want your sister to see in the basement?
I just wanted to see my little sister's reaction, she really freaks out easily.
That is a mean thing for you to do. You shouldn't try scaring your siblings especially in the dark. She could get really hurt in the basement if she can't see.
Better than thinking I did the thing for no reason.
I think it's better if you didn't do this at all, there are more safer and funnier ways to prank your sister. The basement is dangerous with the steep stairs, so what if she got really hurt if she got scared there? How about next time you can think of a different way to play a joke?