OMG! That is some video. Just last week Vicki McKenna was talking about having a pet octopus once and how intelligent they are. She had a feeder tank of blue gills for some other type of fish and one day she forgot to seal the octopus' tank and when she came home she thought it had gotten out and died until she followed its slime trail and found it on wall, it had gotten out of the tank and apparently was getting into the feeder tank.
It's no wonder that H. P. Lovecraft made one of his main villains and octopus god.