My Martin D-18 was at my parents place and my dad had some friends over. Apparently, one guy who played guitar just took it out of its case and started jamming on it when my dad wasn't in the room. Then it looks like he just chucked it back in the case without putting the humidifier bags back between the strings, they were just squashed under the guitar in the case. I'm surprised and a bit annoyed. I didn't think people did this. You don't know me, and you play my expensive guitar without asking, without me being there? Of my guitars, that's the one I spent by far the most money to buy, and it's the one I really care about. I let other people play my stuff, if they ask. My electrics, my amp, cool, as long as I know the person is not completely irresponsible. The D-18, I'd probably offer them another guitar if I had one around, and if not, ehh, maybe? But jeez, ask me first, surely?! How do you guys feel about other people using your stuff? With or without asking?