Shanghai Fugu Agreement

In the 1984 coalition document of the German Social Democrats and the new Green Party, there is a mention of the "Shanghai Fugu Agreement", which was supposed to provide special regulations for chefs who were certified to handle the fugu fish.

While it's true that in Japan, chefs must have certification to handle the fish (parts of it are poisonous), the Agreement is fictional, and introduced into the document by the Green Party as a politial prank during a late-night negotiation of the coalition text. It took years before the joke was revealed.