Several Ways in Which to Express Negatory Feelings without Actually Saying So

I'd rather that you didn't.
Please don't.
Stop. That's enough, Randy.
Absolutely not.
Non.
Never in a million years.
When Hell freezes over.
When pigs fly.
I'd love to, but I'm staying home to work on my cottage cheese sculpture.
Ewwwww.
If you do, I swear I'll...et cetera *censored* et cetera.
Why don't we do it my way?
Why don't you go do something else.
I'M watching T.V.
I do not want to play with you.
Oprah just isn't my favorite person.
I already saw that movie.
You are ugly.
I do not wish to conversate with you.
Non, s'il te plait aller.
Nope.