I know every possible noise in my house so, I grab a bright light, up to and including the Thor 10 MCP, since blinding light works great as long as you keep it well in front and away from you. And that's after I have grabbed the phone. Other items depend on what I perceive the noise to be.
I'm old school. It isn't a house you'd want to break into, both because of what isn't in it, and because of what is in it. We ain't got much, but we got a lot.