Anthrax Snow
From SquackleWiki
Anthrax Snow is a type of snow that rains on a certain population. It is really just a huge amount of anthrax. The only cure to this is marshmallows.
Relevant articles:
http://squackle.com/7907/screwed-up-chronicles/marshmellows-the-cure-to-anthrax/ http://squackle.com/21367/dictionary/anthrax-snow/