I make my sandwich out of homemade bread that is kind of dry, so it makes a lot of crumbs. In between bites I set it down on the ziploc bag, which gets covered with crumbs. When I am finished I pick up the bag and put in my garbage can.
Why am I telling you this? Well something a little strange has been happening lately. It just started a couple of months ago. When I pick up the bag, half the crumbs leap into the air as soon as the bag leaves the surface of the desk. There's some static electricity thing happening with the plastic.