These plans that seem improbable are happening.

At first, dreams seem impossible, then improbable, and eventually inevitable.

The impossible often has a kind of integrity to it which the merely improbable lacks. How often have you been presented with an apparently rational explanation of something that works in all respects other than one, which is just that it is hopelessly improbable? Your instinct is to say, 'Yes, but he or she simply wouldn't do that.

It's been with me for many years. I don't seem to want to part with it.

It's an improbable win if you look at where we were Wednesday.

When you have eliminated the impossible, whatever remains, however improbable, must be the truth.