The essential Laughing Squid has all kinds of tentacle appropriate content. Check out what happens to everyone's favorite cornstarch and water colloid, otherwise known as Oobleck, on top of a subwoofer of sorts. Hint: It appears to grow tentacles.
Watch our new cornstarch tentacle overlords here at Laughing Squid.
And here's a glossy photo of some oobleck out at Burning Man, at my theme camp that goes by the same name.
Photo from Loupiote's Flickr and thanks to Walter (a fellow Ooblecker) for pointing out the Laughing Squid link.