Technically, it's no longer static while you are in the process of harvesting or using it.Wikipedia lists a number of different electrostatic generators, including the ever-popular Van de Graaff. Instructables, of course, has directions for building your own.
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Make a Leyden jar. They store static electricity very, and depending on the size, you can even make good size (5 in) sparks!!
Rubbing your back against a plastic chair or if you have carpet and slippers rub those together