My oldest put ketchup on everything when he was little. Ketchup on eggs, ketchup on carrots (raw), etc. It was hard to watch. Thankfully his sisters didn't follow his path, it would have been too heart-wrenching.
I have a friend who puts ketchup on her steak, no matter how good a steak or how well marinated/seasoned it is. First time we grilled out and I served some prime bone-in ribeyes, I marinated them in a wonderful soy and garlic based marinade. When we sat down to eat, she looked at me and said, "Do you have any ketchup?" I about lost my mind, LOL. I asked her to please taste it beforehand and if she still needed ketchup I did indeed have some. She took a bite and said, "Oh this is wonderful! May I please have some ketchup now?"