I'm really tired of you colonials and your spelling :-)
But since I'm an antipodean clonial myself, I better not sling mud. It might stick!
I *have* seen mud behave much like that, when a sticky surface layer has semi-dried over a more liquid interior. As you walk across it, you gain 1/4" of mud with each step, and suddenly notice you are balanced on these wierd platform shoes, and your feet weigh a ton.
But this "magic carpet" is different in the way it seperates quite cleanly again from the object it has adhered to.
I await detailed investigation with keen anticipation.
