I used to keep a dozen or so, automotive ign, condensers, 'Remember those things that were inside of the distributors next to the points, OH um, those are gone now too.' Anyway, I would load them up with the spark from the coil wire bend the condenser wire around until it was close to the body of the condenser and place them strategically in all of my desk drawers. I would immediately when someone was meddling in my desk where they shouldn't have been.