Salt on Fruit?

In the drama “Lunch Queen“, there is a scene where a few of the characters are arguing about whether it is better to put salt on watermelon or not. I think I have put salt on watermelon just once, but I do remember having salt on pineapple when we ate it (fresh pineapple) in Hawaii visiting family. One memory was when we got to the hotel in Honolulu and had pineapple in the room. Where did that salt come from? Maybe we had a small kitchen in the room? Anyways, I have to say that I do prefer pineapple with salt, although it really isn’t a big deal. It is kind of weird tho, salting fruit.