http://www.cnn.com/2006/US/09/26/kil....ap/index.html
Basically, a teddy bear clogged up a drain at a fish hatchery, and blocked airflow - suffocating 2500 trout.
Officials don't know how the teddy bear got there, but they issued a written warning - "RELEASE OF ANY TEDDY BEARS into the fish hatchery water IS NOT PERMITTED."
