In 1984, a janitor at Jacques Couseau's Oceanographic Museum in Monaco absent-mindedly emptied a bucket of water from an abandoned aquarium, which contained a few fronds of Caulerpa, into the sea.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/attack-killer-weed
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/newsweek-new-york
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment