I was playing video games when my little sister came in my room.
"Hey brother, you know I hate you, don't you?"
I answered without my eyes' leaving the screen:
"Yeah, I do know that."
"But I'm you're sister."
"Yeah, I do know that."
"So I would like to ask you to do something for me."
"Yeah, I do know that."
"Please stop it right now. I'm not totally dumb!"
I pushed the start button and looked at my sister's eyes.
"I'm sorry honey, I didn't know that."