Can you walk on water? Yes, you can... but only if the if water is mixed with the proper quantity of corn starch. This mixture is a non-newtonian fluid.
Below this lines we can find the two videos we saw in class and one more.
The first one is a TV commercial of a bank.
The second video belongs the TV show Time Warp (A cámara superlenta) from Discovery Channel.
This non-newtonian fluid has also appeared in Mithbusters
(Cazadores de mitos).
One of the funniest TV series of the moment, The big bang theory, shows this stuff in one the episodes.