Picture of vampire squid nicked from Pharyngula
S—, as you may or may not care to know, loves the cephalopod: squid, octopus, cuttlefish, she likes
them all. The following two links, both found at Pharyngula are for her.
First, there’s an interesting overview of cephalopod evolution, slightly marred by forced attempts to be hip involving Kang and Kodos, the alien squid monsters from the Simpsons, that’s right. Ignore this and you still have a good article, especially for those not as into the cephalopod as S—.
Second, take a look at what happens when a big octopus meets an equally sized shark in this videoclip from the Seattle Aquarium (Realplayer required). Suffice to say that the aquarium staff got a slightly surprising answer to their question as to why the sharks in this tank kept dying….