This isn't snarky, it's the right answer! Mavericks prevents opening unsigned apps when you double-click, but Right-Click -> Open will launch a pop-up asking "A

This isn't snarky, it's the right answer! Mavericks prevents opening unsigned apps when you double-click, but Right-Click -> Open will launch a pop-up asking "Are you sure you want to open this?", allowing you to bypass the protection. It's a real thing.