Mentaiko sembei (rice crackers). I want to love you like so many others do. I really do. We are just incompatible.
I really am open-minded about food. I'll try nearly anything, and I'll even make a good faith effort to like things which I experience repeatedly. That being said, mentaiko, or spicy cod roe, and anything flavored with it was just not something I could come to like. The strange thing is that I can generally come to appreciate anything which is flavored with chili. Since I write a snack review blog, I've obviously sampled things which are mentaiko flavored. They always seemed to be "off" to me in some fashion. They either had a weird combination of spices or were just too "fishy".
Mentaiko is one of the most popular flavors in Japan and, unfortunately, I never came to like it and certainly do not miss it.