Corrected entry: In the beginning sequence of the movie, while the camera is flying over the conveyor belt it shows a bunch of fans that are used to cool the chocolate enough to be picked up without falling apart. The fans that are used to do this are upside down. The air flow created from such a fan would blow up, not down, thus not blowing any air on the chocolate. This is apparent when the camera angle is parallel to the blades.
Jazetopher
3rd Jan 2007
Correction: The inverted fans are not used to "cool down" the chocolate, but rather they are "pulling" the warm air AWAY from the chocolate bars. If you place several powerful fans facing the chocolate, it would be blowing hard enough to cause the not-yet-solid chocolate bars to all be misshaped.
Jazetopher