@tubetime
Intermittently shorting some of the pins as they jostle about. Any cap will discharge through the silicon quickly to another cap on another pin. Seems not ideal.
@tubetime
I'm just guessing. Same as you. Impossible to know which pins will contact the foil and when. But when they do you're just hooking up a jumper wire. That's why all ESD pads, foams and bags are manufactured to have a moderate, nonzero impedance.
Gregory's Server
@hobs it keeps all the pins shorted to each other.