Exactly! It might taste fantastic, it might be terrible. But it won't hurt you no matter what.
I have a friend who made plum wine over 25 years ago. It was really high alcohol, not very good, and he sort of forgot about it. Last summer, he found it. It has "madeirized", but it's actually good. By "madeirized", I mean it oxidized so that it picked up notes of madeira, or sherry. That's usually not desirable, but in this high alcohol plum wine, it's wonderful! It actually tastes a bit like brandy, so he calls it "plum brandy". He gifted us with the last jug. I have it in the basement with a screw top on it. And I plan on drinking it, and sharing it, like a liqueur in small glasses after dinner.
So, if it's oxidized because of the screw cap, you might find it even better than you thought! If it tastes sour or otherwise bad, you're not out anything at all by trying it. No known pathogens can survive in a high alcohol environment, so don't worry about getting sick. (unless you drink way too much of it- then you may get a bad hangover).