Özi pointed us to a this excellent song about candiru, the most feared fish in South America (even over the piranha!). The song was done by Ray Troll, Ashley Byler, Patrick Troll, and Stephan Jackson.
Why? The candiru has a knack of swimming up the male genitals, lodging itself with its spines, and feed on blood!
http://www.trollart.com/sound/candiru/index.html - Thanks özi!