Amazing! I didn't know that...

[zidane1strife]

You actually float in quicksand!!!
http://science.howstuffworks.com/quicksand.htm

It should've been obvious, but I never thought much about it

 

[Humus]

Well, it's quite obviously. It's just sand and water mixed. A human body has roughly the same density as water, even slightly less, and sand is much more dense, so in total quicksand would be a decent deal more dense than the body.