Sister's Random Statement of Fact....and Reiteration of Her Authority

Sister, confidently: "He is called Dark Vadar because his suit is black."

Me, gently: "Well, his name is DarTH Vadar." 

Silence. The look. Silence.

Me, just trying to help: "It's DarTH Vadar. D-A-R-T-H. DarTH."

Sister, staring into my soul: "Yes. I know that, Mommy. Stop telling me that."