Movies bearing a scene on quicksand got it all wrong when it comes to this aspect. Unlike what the movies have led us to believe, you don't actually get sucked up by a quicksand but just like every other liquid, you can sink in a quicksand up to an extent but due to its thick nature.
Movies have a way to make myths to appear as if they are real. This is how they made us think that if someone should pour petrol on a car and the area surrounding the car, and then throw a lit cigarette on the petrol poured on the floor, it will cause the car to catch fire. I recently learnt how untrue that theory is. I have always thought that quick sand can literally bury someone alive, am glad you just corrected that notion. Great article @logic42
Will you blame them, anything to make the movie a hit. In a quicksand you float with respect to your weight and the weight of the liquid and due to the mixture of sand silt and water, chances of floating is higher.
Watched so many of that I can't count, thanks for adding that, anyway it's quite fun to watch sometimes.. now you met a movie freak