A good scientist would see the difference between absolute proof, proof beyond a reasonable doubt, and pure opinion though. Evolution is admittedly what you and I call reasonable doubt so we can easily say "prove that it didn't happen", which is proving a negative.<quoted text>Great thing about science.
It's rue whether you believe in it or not.(Paraphrase from Neil DeGrasse Tyson)
I prefer to suggest that the phrase "demonstrate natural examples that don't fit Evolutionary theory" is a better place to start. Scientists CAN make mistakes. We can find random mutations in the fossil record that represent random mutations without being the result of Evolution. It's best to avoid defending Evolution as absolute fact.