Nudibranch

Since I seem to know a suprising amount of people who don't know what a nudibranch is ( including someone who has a DEGREE IN BIOLOGY!), here are some pictures:
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Order: Nudibranchia

No, these are not the same as Platyhelminthes (flatworms), and yes, I just like to say Platyhelminthes