No way! I'm too chicken to try it! But, my father does it all the time. I tasted his once when I was a child and it tasted like salty watermelon to me. I love the taste of sweet watermelon.
I never heard of it on apples but my mom puts it on watermellon and my dad did too when he was alive. I never understood it. Fruit is suppose to be SWEET why would anyone put salt on it? I've tried the salted watermellon and its just nasty. I don't get it???