(shorting a couple farads from a super cap to ground *will* burn several cm of a copper trace right off your pcb, curling it up like witch toes)
@aparrish a few years ago I built a USB Nixie tube driver that used a PWM charge pump with a huge cap to create the hundreds of volts required. I thought I had it discharged when rewiring the circuit, but oops, the arc internally illuminated the entire breadboard and left a huge scortch mark.