Japan is currently in the middle of one of these due to a hot summer last year. It is not as bad as the Norwegian one, however it is not the only one in recent memory, either - there was a butter shortage in Japan in (IIRC) 2008 as well.
Frankly, it feels like we've had butter shortage for the past 5 years. It's ridiculous...
Glad you mentioned it - I had a comment about that as well before reading yours. And the butter is crazy expensive in Japan on top of that (just like fruits vegetables and everything else produced locally, I guess...).