I've been getting some really impressive static charges recently. Last night I got a shock, when I went to unlock my garage after getting out of my car. I didn't feel much, because the charge went though most of my palm and via a big bunch of keys (instead a finger tip). But the key closest to the door lock, emitted a fat 3/4" long spark, with audible click.
Of course, capacitors, while not really static electricity can deliver I nasty belt. I somehow charged a motor-start capacitor the size of a half-can of beans to about 750 V, and forgot to discharge it. Picked it up a couple of hours later, and boy did that bite. Don't know where the 750 V came from, but presumably it was due to the induction in the motor it was connected to - as I only supplied 240 VAC,
In case you were wondering, the motor and capacitor came from an old floppy disk drive.