The most interesting flavor I've seen is "wasabi", which I spotted when traveling home for the holidays. Wasabi flavored Kit-Kat!
I actually didn't get them. I kind of chickened out at the last minute. I do like wasabi, but wasabi and chocolate? Hrm... The sweet-spicy combination could be good.
One of my favorite things about Japan is how the sweets come in an array of interesting flavors—flavors I'd never think of. While Kit-Kat is not a homegrown treat (thank the UK for them), the wasabi flavored ones seem to be a good example of just how daring snack food can get here.
I really should've picked these up.