The Octopod's waterworks become clogged with frightened reef triggerfish. The Octonauts must find a way to flush them out.
Tropes:
- Now You Tell Me: Said verbatim by Barnacles after Shellington informs him that humuhumus spray water jets when they are frightened...right after they just watched said humuhumus do so.
- Toilet Humor: A literal example: One of the humuhumus ends up in the Octopod toilet.
