It's like quicksand but made of clay. Here's a cool video about a quick clay landslide they had in Norway, where just 1 person died, but a huge amount of the land turned to liquid.
This is a tragic story of destruction, yet it is fascinating how this type of clay exists and reacts the way it does. I'm sure most fans of clay here will find it interesting. I thought of putting it in 'off-topic', but because it's clay, I figured the messy forum made sense.
Wow! I have always wondered why wet clay slip would get so thick when adding liquid acrylic paint. There must be sodium or a similar element in acrylic paint. When mixing in even small amounts of liquid acrylic, the wet clay would quickly seize up and even get crumbly.
I had always wanted to drive to the site of the Lemieux landslide to poke around and see if any good clay still exists. There is a large river right there, so it would afford easy clean-up. But I think there is a ground cover over all of the clay, trees, and thin soil. I'd hate to drive hours away for nothing, but I'm still somewhat curious about the area. I'm thankful nobody got hurt in this one, and the town was taken down and removed a couple of years before it happened.