One time, I let one of my friends play one of my acoustics, and had stupidly let him have a can of coke earlier. Well, being the dumb@$$ that he is, he says, "I wonder what would happen if I poured some soda in this little hole right here." And he pours half of the damn soda into the sound hole. Quickly after this, he got a relatively large can of whoop-ass opened upon him. I haven't really seen him since then....