Is it really possible for water to be held in a "cone shape" for a brief period of time?  I just saw this "trick" where a cup of water is turned over onto a table without spilling (using a piece of cardboard.  After removing the cardboard from underneath the cup, the person then removes the cup in a particular way (lifts straight up and twists) and lo and behold, the water stays in it's position as if the cup were still there!?  (watch the video to fully understand)  Is this really possible?  If so, and the real question I'm looking to have answered is, how?  
After further research it appears that deionized water is needed as well.
 A: No, It was CG. The video-maker himself said it. Here: http://forums.cgsociety.org/showthread.php?t=957350
A: Its a trick.
There are 2 vessels:
the outer that we saw, and an inner one, transparent and soft.
Stopt it at 1:48 you will see the water move out from the bottom. Under atmospheric pression the vessel merge down. The image after this moment is truncated and we can not see the remnants in the table.
The water was previously set in rotational motion (before the image restarts after those words).
added:
It is not needed to explore the inner characteristics of the inner vessel but I will try.
My first tough : It can be a soft plastic bag.
My second try:   It can be made of ice. But I suspect it is not so. Rinse the interoir of the vessel, then fridge until ice coated. Rinse again, and repeat,...or two equal vessels one inside the other separated by water and fridge.
Now, with the tiny ice coating prepared. Rinse the exterior of the vessel with warm water. Wait a little and the exterior will be decoupled from the interior vessel. Start the show
added again, my final conclusion
It is a soft bag. The rotational effect is really need to keep the vertical wall under more tension and will prevent the object from immediate collapse. The centrifugal force will add strength to the vertical wall and the vertical component of force will be lower.
If it was the icy vessel the rotational effect was not needed.
A: We used to do the trick with the glass of water and a piece of paper when I was a child. You fill the glass, to the rim it is more successful, cover with a dry piece of paper or a bit of flat aluminum foil, put your hand flat over it, and upend it slowly. Slowly remove the hand. The water does not empty. The paper stays. The weight of the water is balanced by the ambient pressure and the suction that occurs at the top, as  gravity pulls the water down and a vacuum is formed at the top of the glass.
At first glance I thought that conservation of the angular momentum given by the twist, same with a spinning top, would keep the water there ( it looks as if it is spinning in the video). But the suction from the removal of the glass (goes plop, I am an experimentalist after all) could not produce such an unperturbed shape, imho. So I vote that it is a trick, although the way the water collapses without any debris of bags is realistic, so there must be video manipulation too.
A: Let's split up the forces, it gives an easier view on what should happen. 
Horizontal Forces
What we see is a centrifugal force.

Centrifugal force (from Latin centrum, meaning "center", and fugere, meaning "to flee") represents the effects of inertia that arise in connection with rotation which are experienced as an outward force away from the center of rotation

So, outward force away from the center of rotation. This means that the water would only be able to appear in place if there is a force in the opposite direction, which is known as friction. Where is the friction if you take the glass away? There is no friction anymore, thus that video shows special effects. ;-)

Vertical Forces
There's also the gravitational force. What would keep the water up so long? Nothing.

Furthermore, if you look at his other videos, you can confirm it's CGI... :-)
A: The spinning action he imparts is not enough to set the entire mass of water spinning for a start. Due to frictional forces within the static fluid mass, it would take considerably more time to set the entire mass into motion than his quick twisting action. Water is a fluid, not a solid as some misinformed poster stated in reference to using bricks. Solids can hold shape as they are just that, a solid. Ice will hold shape too; you can stack ice but you can't stack water.
Gravity will force the collapse of the water column as soon as the glass is no longer supporting it. There is also the issue of the water adhering to the glass surface due to surface tension effects. This is just trickery with CGI, and yes there are CGI tools available to the public for doing these slick effects.
