I was just chatting to someone who asked me how to go about juggling sand.
Juggling sand is really like project management, if you spend some time planning how to do it, think laterally, and have a little experience in the subject area, then it is quite achievable!
I'm not going to explain how I would juggle sand for the moment - like projects, there are a variety of ways of achieving your aims...I know how I would do it, but perhaps there are some suggestions from readers out there? ;-)
(Update 18Feb12 - Just so that people don't think that I don't know how to achieve this, I would mix the sand with water and freeze it so that the sand is solid, and then juggle it!)