Brendan;
You've got it.
There is an observable *fact* of evolution, and a Theory of Evolution that attempts to explain it (theory being a very very well tested, but still only provisionally "true" hypothesis).
Similarly, there is an observable fact of gravity, and a Theory of Gravity. Oh, wait. No there isn't. It is the crappiest theory in modern science. But the fact of gravity is still observable.

Thus, when confronted by the YEC types and their "Evolution is only a theory" or the "Theory of Evolution is full of gaps and inconsistencies", it is fun to point out that the Theory of Gravity doesn't even exist...but you're not floating off the Earth are you?