I totally agree that mustard belongs on a Hot Dog, and Ketchup belongs on a Burger and fries. I have to admit, to my mind though, pickles, peppers and tomatoes just don't seem to go on a Hot Dog. Relish, spicy mustard, onions, saurkraut OK...... Guess that maybe if I actually ever tried a Chicago Dog I might feel differently about it.
I also agree that pineapple (or any fruit) does NOT belong on a pizza. Cheese, pepperoni, sausage, meatball, tomatoes OK...... I've also never had a Chicago style deep dish pizza... they sound good, but I've never had one. Having been a New Yorker most of my life I like a thin crust pizza with extra cheese and meat toppings, and Hot Dogs with spicy mustard and onions in the red sauce.
......and my toilet paper comes over the top.
Why am I suddenly hungry???