I always buy Skippy Peanut Butter. As a snack, it goes quite well with bananas.
I tried buying another brand once. I peeled the banana and then opened the jar. There was a shimmering pool of oil (or some viscous substance) floating above what I assume was the peanut butter. The sight made me think I should be 'Oreo-dunking' the banana. Still, after many years, the thought makes me well, gag a little.