Katherine and Bonnie in “Unfinished Business”

Katherine

I don't think red's really your color, Bon-Bon.

Bonnie

And here I was hoping the ghost of anyone would have killed you already.

Katherine

Funny you should mention death because I'm here to collect that immortality you've promised me.

Bonnie

Funny you think you're still going to get it. I told you, Qetsiyah's the only witch who knows the immortality spell. If she was a no-show, you're out of luck.

Katherine

See? Here's the thing, Bonnie. I can't disagree with you because I have been feeling out of luck lately, but you know who has been getting all of my luck? My beloved doppelganger, Elena. My shadow self is living a better life than I am, so if I don't get that immortality, I may just have to get rid of her altogether.

Bonnie

Did you just threaten my best friend? I can crush your skull without even flinching.

Katherine

Go ahead. Make your move.