Capacitors can save your life!
Hitchcock's 1954 Rear Window Clip 1 Clip 2

(Old cathode ray tube) TVs have ~250 capacitors, some of which are charged up to 25,000 Volts and can remain charged for days! Folks who repair TVs know that it is prudent to carefully discharge and test large capacitors before doing anything! (and unplug the TV ...)

The impact of a dielectric on a capacitor.

Intellectual discussion from QVC.