Well, let's see, my glasses, DEFINITELY, after all, I've got to see through the darned things. How would you like to have scratches on your eye balls?
My car, I mean truck? It's a truck, ya know? It's supposed to get scratched. My second car was a '57 Chevy Nomad, and the head tech where I worked at the time, was an old Caddie combination man. He filled everything in lead, the old fashioned way, and then put 21 coats of paint on that sucker, all hand rubbed by moi! I ended up selling the car six months later, because I was so paranoid about driving it, and worse yet, parking it. I've never built a "pretty" car since.
My guitars. Well, that depends. Frankenbass? Yeah, it's got bumps and bruises, just don't knock it against anything too hard. Mr. Reactor? While it has no real battle scars, I probably (hmm?) wouldn't flip out if it got a small nick, although I do keep one of those protector pads (they're called a "Scratch Pad") on the back of it. My Epi? It's a 35 year old acoustic, so be gentle. My custom painted Mulsanne Blue Les Paul Studio and the new G&L bass. DO NOT come near them wearing a buckle or any metal jewelry! In fact, look, but don't touch. They both live in their case when not being played.
Cases, etcetera? While I try my best to avoid scars, it's a tough world out there, and a case's job is to protect its contents, kind of like what the Secret Service does for the President. You don't want something to happen, but eventually it will!
Well, that is my take. Now, back to cuttin' wood!