What evidence that if shown to you would result in you accepting the theory of evolution as fact?

The problem is that evolution has been observed and documented. But fundies do not accept evolution because a dog does not produce a cat, but that would be going from species to genus to family to genus to species. You cannot argue with those absurdities and they think they are being intelligent. When you argue with an idiot they drag you down to their level and beat you with experience.