In a practical sense, of course, we are really just talking semantics. . . after all, everyone knows what happens when you drop a rock within the atmosphere of planet Earth.
Did you ever see Jim Carey in "Dumb and Dumber"? Remember where he asks the girl if there's a chance for him to get together with her? She says "yeah, like a million to one". He excitedly responds, "So, you're saying there's a chance. I can work with that". Hilarious scene.
In a scientific sense, though, Gravity AS A THEORY is only valid as long as no one proves it wrong, i.e., no one finds the one in a blue million exception to it. So, if you do drop a rock and it goes up, then you have cause for demanding them to discard or amend the theory based on your information.
As for Evolution being a testable hypothesis, well, that has been debated ad nauseum here and there is no point in re-hashing it. The old textbooks from the 60's and 70's used to say that it could never be tested b/c it takes too long to observe. Now the scientists say it can be tested in a lab and verified.