There's a type of barnacle known as rhizocephalan which messes up crabs and shrimp, it's really crazy. I heard about it the other day and had to find out more. The barnacle basically takes over the mind of the crab and stops it from reproducing: instead of producing its own egg sac or whatever, the barnacle produces its own that the crab takes care of and protects as though it had a bunch of little crab babies in it. Even stranger, if one latches onto a male crab, it turns the male into a female, effectively.
I don't know why I wanted to share this on TNL, but here are some links about the thing. It's oddly interesting. Imagine if the barnacle could affect us?
http://www.mesa.edu.au/friends/seash...arasitism.html
http://en.wikipedia.org/wiki/Rhizocephala
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