Static charge in a ream of paper can cause sheets of paper to stick together while inside of a copier. This means that during the printing process, your machine could grab multiple sheets on accident and cause a jam.
To remove static charge from a ream, introduce as much air as you can in between the sheets. Pulling apart the sheets in a ream dissipates the static charge and allows the sheets to easily slide apart.
When there is low static charge within a ream, the printer will be more likely to grab only one sheet when printing and not jam.
Below is video showing you how to properly reduce the static charge in a ream.