Are you afraid when somebody who doesn't know how to play guitar, wants to play your guitar badly, and he just does something weird with it that looks harmful, or he tries this 'slap' he's seen bass players doing, and just seems like he's f'ing with your strings???
Or something similar...
A friend of mine did everything above and I was just about to say, NOOOOOOOOOOOOOOOOO!!!!! STOP!!!!!!
Tell us your thoughts.