My sweetie always put peanut butter (creamy) on his hamburger. I never tried it.
Talk about weird combos...knew a girl who would eat the following all together...
Pancakes
Butter on pancakes
Over easy egg on pancakes
Ketchup on top of that
Topped with maple syrup
The mixture of egg yolk, ketchup and syrup seemed a sacrilege on the taste buds. I didn’t try...but I would guess it was tolerable.