Persimmons. I know they're available at least in the bay area because I had them when I lived there briefly, but have never found them in my regular home in the pacific northwest. I also don't remember them as a kid growing up in Tennessee.
No, but my oldest son(6) loves them. There used to be an olives stand at the farmer's market near us and we surprised them by bringing a toddler who wanted olives. We let him try a bunch of different kinds. I will eat olives if I'm drunk and someone gives me a slice of pizza that has them, but otherwise they're a no for me.
how extreme?