Found via Marginal Revolution via Geekpress is this list of “Scary” ice cream flavors, mostly in Japan:

9. Koshihikari Rice Ice Cream. A strong local preference for Japan’s favorite rice, koshihikari, has long prevented foreign farmers from gaining a foothold in the lucrative Japanese rice market. Koshihikari is also used to make some of Japan’s finest sake. But koshihikari is one rice strain that is something of a strain to stomach when used in ice cream