In any case, it's trivial to say that science has "debunked" quicksand. If anything, recent work on unstable granular media has revealed a far more diverse and complex set of phenomena than anyone imagined. Traditional scientific accounts describe just one type—the classic "artesian quicksand" shown in the MythBusters episode. That's ordinary sand that has been saturated with upwelling moisture: Given enough water, the sand liquefies, and the grains start to flow like a viscous fluid. But in the past 10 years or so, physicists have started looking at more interesting formations of sediment, in places where grains of sand or clay are assembled in delicate, latticelike structures. Step in one of these, and it collapses like a house of cards—before reforming in a dense pack around your feet.
Quicksand survives in movie fan clubs and fetish groups who avidly collect footage featuring quicksand. Daniel Engber put together a look at the phenomena of quicksand itself, quicksand fans, and a history of quicksand in the movies. Link