From the very beginning you know it's going to end badly.

If this has never happened before, how do you know it will end badly?

Given Hollywood's approach to these things, this can only end badly.

Had she not come in, it might have ended badly.

The cycle probably will end badly, but there is no way to tell how soon.

I would not like things to end badly for you.

"This is going to end badly, and everybody knows it, but when?"

They almost always ended badly for the male on the other end of the conversation.

And I'm afraid it all may have ended badly for her.

But we've seen this scene before, and it has usually ended badly.