it's sort of a tradition in the office where I work that if you go on holiday you bring back a confectionary local to the area you visted
the last few years I've been to Japan and these are the foodstuffs that disappeared quickly when I unloaded them on my desk
Whole grain biscuit Kit Kat - these did not last a day

Lemon Kit Kat - these didn't last much longer than a day either
Strawberry Kit Kat
I held on to the boxed version because they were so nice, but I did place a bag from Don Quijote on my desk and they disappeared in seconds
this one couldn't be tasted by everyone because it's haram:
Sake kit kat
definitely alcoholic
these were just plain weird and nobody liked them:
wasabi kit kat