[Yo-Yo]

The trick boils down to reducing the amount of static electricity generated by grinding whole coffee beans, which otherwise causes them to clump together and clog up the grinder, creating a whole lot of mess and waste.

I prefer to spray my beans with a bit of Static Guard before grinding...

[HartleyMBaldwin]

I was going to suggest tossing a dryer sheet into the grinder, but the spray stuff would work too.