Static can be a bear... blowing air across plastics will generate a charge....
I worked at a plastic injection molding company for a while... we had hoppers on the presses for the plastic pellets... the pellets were sucked out of a plastic 55gal drum sitting beside the machine, up into the hopper, as needed.... so, you have plastic pellets being sucked out of a plastic drum, up through a plastic hose into a metal hopper..
Talk about building up a static charge... we had grounding straps that supposedly drained off the static.... unless the material handler forgot to connect the strap to the machine...
imagine the loudest finger snap that you have heard... that's what it sounded like when you got within 6" of the plastic drum. It hurt. I've seen it arc across 3-4" of airspace.... that is a LOT of voltage. It's a good thing there wasn't much amperage to it, or it would have killed you....