To make this I used a piece of wood for the wall and had my dad drill 2 holes in it (one for the hose and another for the fog machine) then I asked him to pour the water in the hose, as it fell in the floor I pressed the smoke button at the same time I took the picture to get the "cloud" effect.
This is how it looked before pouring the water and the smoke, I disguised the hose with cotton in case the smoke wouldn't cover it all.
Equipment Setup:
Camera: Canon 5DIII
Lens: Canon 28-135
Flash: Lumopro LP160 @ 1/4 power
Flash trigger: Cactus v5