They lose some of their sound, literally. This is very audible with the mandolin, it gets quite muted as the strings age. What a difference when you change them.

…the suspense is killing me! What is it?

GTX 770 here!

I for one still find it amusing how it can get stuck on different things every now and then. Even after all these years. Especially when it chews on my wife’s stuff and I can make fun of it.