+1 for the Asher reference.

First Rule!

I also had the opportunity to try this in Taegu S.Korea.

Trai_dep's account is spot right on. The strangest part of the whole deal was peeling the suckers off the inside of my teeth.

We had the dish at a friends home and selected the octopus ourselves out of a tank at the nearby fish market. The twitching continued for 30+ min after the animal was butchered.